^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) * arch/alpha/boot/main.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 1994, 1995 Linus Torvalds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * This file is the bootloader for the Linux/AXP kernel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <generated/utsrelease.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <asm/console.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <asm/hwrpb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <stdarg.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include "ksize.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) extern unsigned long switch_to_osf_pal(unsigned long nr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) struct pcb_struct * pcb_va, struct pcb_struct * pcb_pa,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) unsigned long *vptb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) struct hwrpb_struct *hwrpb = INIT_HWRPB;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) static struct pcb_struct pcb_va[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * Find a physical address of a virtual object..
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * This is easy using the virtual page table address.
^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) static inline void *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) find_pa(unsigned long *vptb, void *ptr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) unsigned long address = (unsigned long) ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) unsigned long result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) result = vptb[address >> 13];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) result >>= 32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) result <<= 13;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) result |= address & 0x1fff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) return (void *) result;
^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) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * This function moves into OSF/1 pal-code, and has a temporary
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) * PCB for that. The kernel proper should replace this PCB with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * the real one as soon as possible.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * The page table muckery in here depends on the fact that the boot
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) * code has the L1 page table identity-map itself in the second PTE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) * in the L1 page table. Thus the L1-page is virtually addressable
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * itself (through three levels) at virtual address 0x200802000.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) #define VPTB ((unsigned long *) 0x200000000)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) #define L1 ((unsigned long *) 0x200802000)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) pal_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) unsigned long i, rev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) struct percpu_struct * percpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) struct pcb_struct * pcb_pa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) /* Create the dummy PCB. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) pcb_va->ksp = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) pcb_va->usp = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) pcb_va->ptbr = L1[1] >> 32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) pcb_va->asn = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) pcb_va->pcc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) pcb_va->unique = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) pcb_va->flags = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) pcb_va->res1 = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) pcb_va->res2 = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) pcb_pa = find_pa(VPTB, pcb_va);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) * a0 = 2 (OSF)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) * a1 = return address, but we give the asm the vaddr of the PCB
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) * a2 = physical addr of PCB
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) * a3 = new virtual page table pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) * a4 = KSP (but the asm sets it)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) srm_printk("Switching to OSF PAL-code .. ");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) i = switch_to_osf_pal(2, pcb_va, pcb_pa, VPTB);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) if (i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) srm_printk("failed, code %ld\n", i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) __halt();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) percpu = (struct percpu_struct *)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) (INIT_HWRPB->processor_offset + (unsigned long) INIT_HWRPB);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) rev = percpu->pal_revision = percpu->palcode_avail[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) srm_printk("Ok (rev %lx)\n", rev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) tbia(); /* do it directly in case we are SMP */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) static inline long openboot(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) char bootdev[256];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) long result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) result = callback_getenv(ENV_BOOTED_DEV, bootdev, 255);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) if (result < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) return result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) return callback_open(bootdev, result & 255);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) static inline long close(long dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) return callback_close(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) static inline long load(long dev, unsigned long addr, unsigned long count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) char bootfile[256];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) extern char _end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) long result, boot_size = &_end - (char *) BOOT_ADDR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) result = callback_getenv(ENV_BOOTED_FILE, bootfile, 255);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) if (result < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) return result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) result &= 255;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) bootfile[result] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) if (result)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) srm_printk("Boot file specification (%s) not implemented\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) bootfile);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) return callback_read(dev, count, (void *)addr, boot_size/512 + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) * Start the kernel.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) static void runkernel(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) __asm__ __volatile__(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) "bis %1,%1,$30\n\t"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) "bis %0,%0,$26\n\t"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) "ret ($26)"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) : /* no outputs: it doesn't even return */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) : "r" (START_ADDR),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) "r" (PAGE_SIZE + INIT_STACK));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) void start_kernel(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) long i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) long dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) int nbytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) char envval[256];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) srm_printk("Linux/AXP bootloader for Linux " UTS_RELEASE "\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) if (INIT_HWRPB->pagesize != 8192) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) srm_printk("Expected 8kB pages, got %ldkB\n", INIT_HWRPB->pagesize >> 10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) pal_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) dev = openboot();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) if (dev < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) srm_printk("Unable to open boot device: %016lx\n", dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) dev &= 0xffffffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) srm_printk("Loading vmlinux ...");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) i = load(dev, START_ADDR, KERNEL_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) close(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) if (i != KERNEL_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) srm_printk("Failed (%lx)\n", i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) nbytes = callback_getenv(ENV_BOOTED_OSFLAGS, envval, sizeof(envval));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) if (nbytes < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) nbytes = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) envval[nbytes] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) strcpy((char*)ZERO_PGE, envval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) srm_printk(" Ok\nNow booting the kernel\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) runkernel();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) for (i = 0 ; i < 0x100000000 ; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) /* nothing */;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) __halt();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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