^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /* SPDX-License-Identifier: GPL-2.0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 1991, 1992 Linus Torvalds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Enhanced CPU detection and feature setting code by Mike Jagdis
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * and Martin Mares, November 1997.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) .text
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/threads.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/linkage.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <asm/segment.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <asm/page_types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <asm/pgtable_types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <asm/cache.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <asm/thread_info.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <asm/asm-offsets.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <asm/setup.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <asm/processor-flags.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <asm/msr-index.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <asm/cpufeatures.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <asm/percpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <asm/nops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <asm/bootparam.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <asm/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <asm/pgtable_32.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) /* Physical address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #define pa(X) ((X) - __PAGE_OFFSET)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * References to members of the new_cpu_data structure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #define X86 new_cpu_data+CPUINFO_x86
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #define X86_VENDOR new_cpu_data+CPUINFO_x86_vendor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #define X86_MODEL new_cpu_data+CPUINFO_x86_model
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #define X86_STEPPING new_cpu_data+CPUINFO_x86_stepping
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #define X86_HARD_MATH new_cpu_data+CPUINFO_hard_math
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #define X86_CPUID new_cpu_data+CPUINFO_cpuid_level
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #define X86_CAPABILITY new_cpu_data+CPUINFO_x86_capability
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) #define X86_VENDOR_ID new_cpu_data+CPUINFO_x86_vendor_id
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) #define SIZEOF_PTREGS 17*4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * Worst-case size of the kernel mapping we need to make:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) * a relocatable kernel can live anywhere in lowmem, so we need to be able
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * to map all of lowmem.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) KERNEL_PAGES = LOWMEM_PAGES
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) INIT_MAP_SIZE = PAGE_TABLE_SIZE(KERNEL_PAGES) * PAGE_SIZE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) RESERVE_BRK(pagetables, INIT_MAP_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * 32-bit kernel entrypoint; only used by the boot CPU. On entry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * %esi points to the real-mode code as a 32-bit pointer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) * CS and DS must be 4 GB flat segments, but we don't depend on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) * any particular GDT layout, because we load our own as soon as we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) * can.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) __HEAD
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) SYM_CODE_START(startup_32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) movl pa(initial_stack),%ecx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * Set segments to known values.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) lgdt pa(boot_gdt_descr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) movl $(__BOOT_DS),%eax
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) movl %eax,%ds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) movl %eax,%es
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) movl %eax,%fs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) movl %eax,%gs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) movl %eax,%ss
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) leal -__PAGE_OFFSET(%ecx),%esp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) * Clear BSS first so that there are no surprises...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) cld
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) xorl %eax,%eax
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) movl $pa(__bss_start),%edi
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) movl $pa(__bss_stop),%ecx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) subl %edi,%ecx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) shrl $2,%ecx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) rep ; stosl
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) * Copy bootup parameters out of the way.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) * Note: %esi still has the pointer to the real-mode data.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) * With the kexec as boot loader, parameter segment might be loaded beyond
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) * kernel image and might not even be addressable by early boot page tables.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) * (kexec on panic case). Hence copy out the parameters before initializing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) * page tables.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) movl $pa(boot_params),%edi
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) movl $(PARAM_SIZE/4),%ecx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) cld
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) rep
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) movsl
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) movl pa(boot_params) + NEW_CL_POINTER,%esi
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) andl %esi,%esi
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) jz 1f # No command line
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) movl $pa(boot_command_line),%edi
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) movl $(COMMAND_LINE_SIZE/4),%ecx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) rep
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) movsl
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) #ifdef CONFIG_OLPC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) /* save OFW's pgdir table for later use when calling into OFW */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) movl %cr3, %eax
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) movl %eax, pa(olpc_ofw_pgd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) #ifdef CONFIG_MICROCODE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) /* Early load ucode on BSP. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) call load_ucode_bsp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) /* Create early pagetables. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) call mk_early_pgtbl_32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) /* Do early initialization of the fixmap area */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) movl $pa(initial_pg_fixmap)+PDE_IDENT_ATTR,%eax
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) #ifdef CONFIG_X86_PAE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) #define KPMDS (((-__PAGE_OFFSET) >> 30) & 3) /* Number of kernel PMDs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) movl %eax,pa(initial_pg_pmd+0x1000*KPMDS-8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) movl %eax,pa(initial_page_table+0xffc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) jmp .Ldefault_entry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) SYM_CODE_END(startup_32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) #ifdef CONFIG_HOTPLUG_CPU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) * Boot CPU0 entry point. It's called from play_dead(). Everything has been set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) * up already except stack. We just set up stack here. Then call
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) * start_secondary().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) SYM_FUNC_START(start_cpu0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) movl initial_stack, %ecx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) movl %ecx, %esp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) call *(initial_code)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 1: jmp 1b
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) SYM_FUNC_END(start_cpu0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) * Non-boot CPU entry point; entered from trampoline.S
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) * We can't lgdt here, because lgdt itself uses a data segment, but
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) * we know the trampoline has already loaded the boot_gdt for us.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) * If cpu hotplug is not supported then this code can go in init section
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) * which will be freed later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) SYM_FUNC_START(startup_32_smp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) cld
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) movl $(__BOOT_DS),%eax
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) movl %eax,%ds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) movl %eax,%es
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) movl %eax,%fs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) movl %eax,%gs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) movl pa(initial_stack),%ecx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) movl %eax,%ss
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) leal -__PAGE_OFFSET(%ecx),%esp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) #ifdef CONFIG_MICROCODE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) /* Early load ucode on AP. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) call load_ucode_ap
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) .Ldefault_entry:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) movl $(CR0_STATE & ~X86_CR0_PG),%eax
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) movl %eax,%cr0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) * We want to start out with EFLAGS unambiguously cleared. Some BIOSes leave
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) * bits like NT set. This would confuse the debugger if this code is traced. So
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) * initialize them properly now before switching to protected mode. That means
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) * DF in particular (even though we have cleared it earlier after copying the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) * command line) because GCC expects it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) pushl $0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) popfl
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) * New page tables may be in 4Mbyte page mode and may be using the global pages.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) * NOTE! If we are on a 486 we may have no cr4 at all! Specifically, cr4 exists
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) * if and only if CPUID exists and has flags other than the FPU flag set.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) movl $-1,pa(X86_CPUID) # preset CPUID level
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) movl $X86_EFLAGS_ID,%ecx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) pushl %ecx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) popfl # set EFLAGS=ID
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) pushfl
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) popl %eax # get EFLAGS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) testl $X86_EFLAGS_ID,%eax # did EFLAGS.ID remained set?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) jz .Lenable_paging # hw disallowed setting of ID bit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) # which means no CPUID and no CR4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) xorl %eax,%eax
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) cpuid
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) movl %eax,pa(X86_CPUID) # save largest std CPUID function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) movl $1,%eax
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) cpuid
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) andl $~1,%edx # Ignore CPUID.FPU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) jz .Lenable_paging # No flags or only CPUID.FPU = no CR4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) movl pa(mmu_cr4_features),%eax
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) movl %eax,%cr4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) testb $X86_CR4_PAE, %al # check if PAE is enabled
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) jz .Lenable_paging
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) /* Check if extended functions are implemented */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) movl $0x80000000, %eax
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) cpuid
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) /* Value must be in the range 0x80000001 to 0x8000ffff */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) subl $0x80000001, %eax
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) cmpl $(0x8000ffff-0x80000001), %eax
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) ja .Lenable_paging
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) /* Clear bogus XD_DISABLE bits */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) call verify_cpu
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) mov $0x80000001, %eax
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) cpuid
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) /* Execute Disable bit supported? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) btl $(X86_FEATURE_NX & 31), %edx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) jnc .Lenable_paging
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) /* Setup EFER (Extended Feature Enable Register) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) movl $MSR_EFER, %ecx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) rdmsr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) btsl $_EFER_NX, %eax
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) /* Make changes effective */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) wrmsr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) .Lenable_paging:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) * Enable paging
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) movl $pa(initial_page_table), %eax
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) movl %eax,%cr3 /* set the page table pointer.. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) movl $CR0_STATE,%eax
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) movl %eax,%cr0 /* ..and set paging (PG) bit */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) ljmp $__BOOT_CS,$1f /* Clear prefetch and normalize %eip */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) /* Shift the stack pointer to a virtual address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) addl $__PAGE_OFFSET, %esp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) * start system 32-bit setup. We need to re-do some of the things done
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) * in 16-bit mode for the "real" operations.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) movl setup_once_ref,%eax
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) andl %eax,%eax
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) jz 1f # Did we do this already?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) call *%eax
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) * Check if it is 486
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) movb $4,X86 # at least 486
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) cmpl $-1,X86_CPUID
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) je .Lis486
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) /* get vendor info */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) xorl %eax,%eax # call CPUID with 0 -> return vendor ID
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) cpuid
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) movl %eax,X86_CPUID # save CPUID level
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) movl %ebx,X86_VENDOR_ID # lo 4 chars
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) movl %edx,X86_VENDOR_ID+4 # next 4 chars
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) movl %ecx,X86_VENDOR_ID+8 # last 4 chars
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) orl %eax,%eax # do we have processor info as well?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) je .Lis486
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) movl $1,%eax # Use the CPUID instruction to get CPU type
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) cpuid
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) movb %al,%cl # save reg for future use
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) andb $0x0f,%ah # mask processor family
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) movb %ah,X86
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) andb $0xf0,%al # mask model
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) shrb $4,%al
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) movb %al,X86_MODEL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) andb $0x0f,%cl # mask mask revision
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) movb %cl,X86_STEPPING
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) movl %edx,X86_CAPABILITY
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) .Lis486:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) movl $0x50022,%ecx # set AM, WP, NE and MP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) movl %cr0,%eax
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) andl $0x80000011,%eax # Save PG,PE,ET
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) orl %ecx,%eax
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) movl %eax,%cr0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) lgdt early_gdt_descr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) ljmp $(__KERNEL_CS),$1f
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 1: movl $(__KERNEL_DS),%eax # reload all the segment registers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) movl %eax,%ss # after changing gdt.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) movl $(__USER_DS),%eax # DS/ES contains default USER segment
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) movl %eax,%ds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) movl %eax,%es
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) movl $(__KERNEL_PERCPU), %eax
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) movl %eax,%fs # set this cpu's percpu
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) movl $(__KERNEL_STACK_CANARY),%eax
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) movl %eax,%gs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) xorl %eax,%eax # Clear LDT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) lldt %ax
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) call *(initial_code)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 1: jmp 1b
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) SYM_FUNC_END(startup_32_smp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) #include "verify_cpu.S"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) * setup_once
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) * The setup work we only want to run on the BSP.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) * Warning: %esi is live across this function.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) __INIT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) setup_once:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) #ifdef CONFIG_STACKPROTECTOR
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) * Configure the stack canary. The linker can't handle this by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) * relocation. Manually set base address in stack canary
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) * segment descriptor.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) movl $gdt_page,%eax
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) movl $stack_canary,%ecx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) movw %cx, 8 * GDT_ENTRY_STACK_CANARY + 2(%eax)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) shrl $16, %ecx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) movb %cl, 8 * GDT_ENTRY_STACK_CANARY + 4(%eax)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) movb %ch, 8 * GDT_ENTRY_STACK_CANARY + 7(%eax)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) andl $0,setup_once_ref /* Once is enough, thanks */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) ret
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) SYM_FUNC_START(early_idt_handler_array)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) # 36(%esp) %eflags
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) # 32(%esp) %cs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) # 28(%esp) %eip
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) # 24(%rsp) error code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) i = 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) .rept NUM_EXCEPTION_VECTORS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) .if ((EXCEPTION_ERRCODE_MASK >> i) & 1) == 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) pushl $0 # Dummy error code, to make stack frame uniform
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) .endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) pushl $i # 20(%esp) Vector number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) jmp early_idt_handler_common
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) i = i + 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) .fill early_idt_handler_array + i*EARLY_IDT_HANDLER_SIZE - ., 1, 0xcc
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) .endr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) SYM_FUNC_END(early_idt_handler_array)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) SYM_CODE_START_LOCAL(early_idt_handler_common)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) * The stack is the hardware frame, an error code or zero, and the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) * vector number.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) cld
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) incl %ss:early_recursion_flag
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) /* The vector number is in pt_regs->gs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) cld
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) pushl %fs /* pt_regs->fs (__fsh varies by model) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) pushl %es /* pt_regs->es (__esh varies by model) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) pushl %ds /* pt_regs->ds (__dsh varies by model) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) pushl %eax /* pt_regs->ax */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) pushl %ebp /* pt_regs->bp */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) pushl %edi /* pt_regs->di */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) pushl %esi /* pt_regs->si */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) pushl %edx /* pt_regs->dx */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) pushl %ecx /* pt_regs->cx */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) pushl %ebx /* pt_regs->bx */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) /* Fix up DS and ES */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) movl $(__KERNEL_DS), %ecx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) movl %ecx, %ds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) movl %ecx, %es
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) /* Load the vector number into EDX */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) movl PT_GS(%esp), %edx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) /* Load GS into pt_regs->gs (and maybe clobber __gsh) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) movw %gs, PT_GS(%esp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) movl %esp, %eax /* args are pt_regs (EAX), trapnr (EDX) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) call early_fixup_exception
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) popl %ebx /* pt_regs->bx */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) popl %ecx /* pt_regs->cx */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) popl %edx /* pt_regs->dx */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) popl %esi /* pt_regs->si */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) popl %edi /* pt_regs->di */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) popl %ebp /* pt_regs->bp */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) popl %eax /* pt_regs->ax */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) popl %ds /* pt_regs->ds (always ignores __dsh) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) popl %es /* pt_regs->es (always ignores __esh) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) popl %fs /* pt_regs->fs (always ignores __fsh) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) popl %gs /* pt_regs->gs (always ignores __gsh) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) decl %ss:early_recursion_flag
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) addl $4, %esp /* pop pt_regs->orig_ax */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) iret
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) SYM_CODE_END(early_idt_handler_common)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) /* This is the default interrupt "handler" :-) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) SYM_FUNC_START(early_ignore_irq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) cld
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) #ifdef CONFIG_PRINTK
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) pushl %eax
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) pushl %ecx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) pushl %edx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) pushl %es
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) pushl %ds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) movl $(__KERNEL_DS),%eax
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) movl %eax,%ds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) movl %eax,%es
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) cmpl $2,early_recursion_flag
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) je hlt_loop
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) incl early_recursion_flag
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) pushl 16(%esp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) pushl 24(%esp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) pushl 32(%esp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) pushl 40(%esp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) pushl $int_msg
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) call printk
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) call dump_stack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) addl $(5*4),%esp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) popl %ds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) popl %es
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) popl %edx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) popl %ecx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) popl %eax
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) iret
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) hlt_loop:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) hlt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) jmp hlt_loop
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) SYM_FUNC_END(early_ignore_irq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) __INITDATA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) .align 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) SYM_DATA(early_recursion_flag, .long 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) __REFDATA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) .align 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) SYM_DATA(initial_code, .long i386_start_kernel)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) SYM_DATA(setup_once_ref, .long setup_once)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) #ifdef CONFIG_PAGE_TABLE_ISOLATION
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) #define PGD_ALIGN (2 * PAGE_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) #define PTI_USER_PGD_FILL 1024
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) #define PGD_ALIGN (PAGE_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) #define PTI_USER_PGD_FILL 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) * BSS section
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) __PAGE_ALIGNED_BSS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) .align PGD_ALIGN
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) #ifdef CONFIG_X86_PAE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) .globl initial_pg_pmd
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) initial_pg_pmd:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) .fill 1024*KPMDS,4,0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) .globl initial_page_table
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) initial_page_table:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) .fill 1024,4,0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) .align PGD_ALIGN
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) initial_pg_fixmap:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) .fill 1024,4,0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) .globl swapper_pg_dir
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) .align PGD_ALIGN
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) swapper_pg_dir:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) .fill 1024,4,0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) .fill PTI_USER_PGD_FILL,4,0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) .globl empty_zero_page
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) empty_zero_page:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) .fill 4096,1,0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) EXPORT_SYMBOL(empty_zero_page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) * This starts the data section.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) #ifdef CONFIG_X86_PAE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) __PAGE_ALIGNED_DATA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) /* Page-aligned for the benefit of paravirt? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) .align PGD_ALIGN
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) SYM_DATA_START(initial_page_table)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) .long pa(initial_pg_pmd+PGD_IDENT_ATTR),0 /* low identity map */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) # if KPMDS == 3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) .long pa(initial_pg_pmd+PGD_IDENT_ATTR),0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) .long pa(initial_pg_pmd+PGD_IDENT_ATTR+0x1000),0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) .long pa(initial_pg_pmd+PGD_IDENT_ATTR+0x2000),0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) # elif KPMDS == 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) .long 0,0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) .long pa(initial_pg_pmd+PGD_IDENT_ATTR),0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) .long pa(initial_pg_pmd+PGD_IDENT_ATTR+0x1000),0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) # elif KPMDS == 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) .long 0,0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) .long 0,0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) .long pa(initial_pg_pmd+PGD_IDENT_ATTR),0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) # else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) # error "Kernel PMDs should be 1, 2 or 3"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) # endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) .align PAGE_SIZE /* needs to be page-sized too */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) #ifdef CONFIG_PAGE_TABLE_ISOLATION
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) * PTI needs another page so sync_initial_pagetable() works correctly
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) * and does not scribble over the data which is placed behind the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) * actual initial_page_table. See clone_pgd_range().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) .fill 1024, 4, 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) SYM_DATA_END(initial_page_table)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) .data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) .balign 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) * The SIZEOF_PTREGS gap is a convention which helps the in-kernel unwinder
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) * reliably detect the end of the stack.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) SYM_DATA(initial_stack,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) .long init_thread_union + THREAD_SIZE -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) SIZEOF_PTREGS - TOP_OF_KERNEL_STACK_PADDING)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) __INITRODATA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) int_msg:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) .asciz "Unknown interrupt or fault at: %p %p %p\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) #include "../../x86/xen/xen-head.S"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) * The IDT and GDT 'descriptors' are a strange 48-bit object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) * only used by the lidt and lgdt instructions. They are not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) * like usual segment descriptors - they consist of a 16-bit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) * segment size, and 32-bit linear address value:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) .data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) ALIGN
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) # early boot GDT descriptor (must use 1:1 address mapping)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) .word 0 # 32 bit align gdt_desc.address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) SYM_DATA_START_LOCAL(boot_gdt_descr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) .word __BOOT_DS+7
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) .long boot_gdt - __PAGE_OFFSET
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) SYM_DATA_END(boot_gdt_descr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) # boot GDT descriptor (later on used by CPU#0):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) .word 0 # 32 bit align gdt_desc.address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) SYM_DATA_START(early_gdt_descr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) .word GDT_ENTRIES*8-1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) .long gdt_page /* Overwritten for secondary CPUs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) SYM_DATA_END(early_gdt_descr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) * The boot_gdt must mirror the equivalent in setup.S and is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) * used only for booting.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) .align L1_CACHE_BYTES
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) SYM_DATA_START(boot_gdt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) .fill GDT_ENTRY_BOOT_CS,8,0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) .quad 0x00cf9a000000ffff /* kernel 4GB code at 0x00000000 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) .quad 0x00cf92000000ffff /* kernel 4GB data at 0x00000000 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) SYM_DATA_END(boot_gdt)
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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