Orange Pi5 kernel

^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) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3) #include <linux/elf.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4) #include <asm/sections.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) #include <asm/setup.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <asm/kexec.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <asm/sclp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <asm/diag.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <asm/uv.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include "compressed/decompressor.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include "boot.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) extern char __boot_data_start[], __boot_data_end[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) extern char __boot_data_preserved_start[], __boot_data_preserved_end[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) unsigned long __bootdata_preserved(__kaslr_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18)  * Some code and data needs to stay below 2 GB, even when the kernel would be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19)  * relocated above 2 GB, because it has to use 31 bit addresses.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20)  * Such code and data is part of the .dma section, and its location is passed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21)  * over to the decompressed / relocated kernel via the .boot.preserved.data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22)  * section.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) extern char _sdma[], _edma[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) extern char _stext_dma[], _etext_dma[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) extern struct exception_table_entry _start_dma_ex_table[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) extern struct exception_table_entry _stop_dma_ex_table[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) unsigned long __bootdata_preserved(__sdma) = __pa(&_sdma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) unsigned long __bootdata_preserved(__edma) = __pa(&_edma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) unsigned long __bootdata_preserved(__stext_dma) = __pa(&_stext_dma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) unsigned long __bootdata_preserved(__etext_dma) = __pa(&_etext_dma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) struct exception_table_entry *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	__bootdata_preserved(__start_dma_ex_table) = _start_dma_ex_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) struct exception_table_entry *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	__bootdata_preserved(__stop_dma_ex_table) = _stop_dma_ex_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) int _diag210_dma(struct diag210 *addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) int _diag26c_dma(void *req, void *resp, enum diag26c_sc subcode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) int _diag14_dma(unsigned long rx, unsigned long ry1, unsigned long subcode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) void _diag0c_dma(struct hypfs_diag0c_entry *entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) void _diag308_reset_dma(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) struct diag_ops __bootdata_preserved(diag_dma_ops) = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	.diag210 = _diag210_dma,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	.diag26c = _diag26c_dma,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	.diag14 = _diag14_dma,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	.diag0c = _diag0c_dma,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	.diag308_reset = _diag308_reset_dma
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) static struct diag210 _diag210_tmp_dma __section(".dma.data");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) struct diag210 *__bootdata_preserved(__diag210_tmp_dma) = &_diag210_tmp_dma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) void error(char *x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	sclp_early_printk("\n\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	sclp_early_printk(x);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	sclp_early_printk("\n\n -- System halted");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	disabled_wait();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) #ifdef CONFIG_KERNEL_UNCOMPRESSED
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) unsigned long mem_safe_offset(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	return vmlinux.default_lma + vmlinux.image_size + vmlinux.bss_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) static void rescue_initrd(unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	if (!IS_ENABLED(CONFIG_BLK_DEV_INITRD))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	if (!INITRD_START || !INITRD_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	if (addr <= INITRD_START)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	memmove((void *)addr, (void *)INITRD_START, INITRD_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	INITRD_START = addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) static void copy_bootdata(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	if (__boot_data_end - __boot_data_start != vmlinux.bootdata_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		error(".boot.data section size mismatch");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	memcpy((void *)vmlinux.bootdata_off, __boot_data_start, vmlinux.bootdata_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	if (__boot_data_preserved_end - __boot_data_preserved_start != vmlinux.bootdata_preserved_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 		error(".boot.preserved.data section size mismatch");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	memcpy((void *)vmlinux.bootdata_preserved_off, __boot_data_preserved_start, vmlinux.bootdata_preserved_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) static void handle_relocs(unsigned long offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	Elf64_Rela *rela_start, *rela_end, *rela;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	int r_type, r_sym, rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	Elf64_Addr loc, val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	Elf64_Sym *dynsym;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	rela_start = (Elf64_Rela *) vmlinux.rela_dyn_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	rela_end = (Elf64_Rela *) vmlinux.rela_dyn_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	dynsym = (Elf64_Sym *) vmlinux.dynsym_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	for (rela = rela_start; rela < rela_end; rela++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		loc = rela->r_offset + offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 		val = rela->r_addend;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		r_sym = ELF64_R_SYM(rela->r_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		if (r_sym) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 			if (dynsym[r_sym].st_shndx != SHN_UNDEF)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 				val += dynsym[r_sym].st_value + offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 			/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 			 * 0 == undefined symbol table index (STN_UNDEF),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 			 * used for R_390_RELATIVE, only add KASLR offset
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 			val += offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 		r_type = ELF64_R_TYPE(rela->r_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		rc = arch_kexec_do_relocs(r_type, (void *) loc, val, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 			error("Unknown relocation type");
^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) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)  * This function clears the BSS section of the decompressed Linux kernel and NOT the decompressor's.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) static void clear_bss_section(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	memset((void *)vmlinux.default_lma + vmlinux.image_size, 0, vmlinux.bss_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) void startup_kernel(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	unsigned long random_lma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	unsigned long safe_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	void *img;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	store_ipl_parmblock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	safe_addr = mem_safe_offset();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	safe_addr = read_ipl_report(safe_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	uv_query_info();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	rescue_initrd(safe_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	sclp_early_read_info();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	setup_boot_command_line();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	parse_boot_command_line();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	setup_memory_end();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	detect_memory();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	random_lma = __kaslr_offset = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && kaslr_enabled) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 		random_lma = get_random_base(safe_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		if (random_lma) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 			__kaslr_offset = random_lma - vmlinux.default_lma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 			img = (void *)vmlinux.default_lma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 			vmlinux.default_lma += __kaslr_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 			vmlinux.entry += __kaslr_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 			vmlinux.bootdata_off += __kaslr_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 			vmlinux.bootdata_preserved_off += __kaslr_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 			vmlinux.rela_dyn_start += __kaslr_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 			vmlinux.rela_dyn_end += __kaslr_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 			vmlinux.dynsym_start += __kaslr_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	if (!IS_ENABLED(CONFIG_KERNEL_UNCOMPRESSED)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		img = decompress_kernel();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		memmove((void *)vmlinux.default_lma, img, vmlinux.image_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	} else if (__kaslr_offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		memcpy((void *)vmlinux.default_lma, img, vmlinux.image_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	clear_bss_section();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	copy_bootdata();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	if (IS_ENABLED(CONFIG_RELOCATABLE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		handle_relocs(__kaslr_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	if (__kaslr_offset) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		 * Save KASLR offset for early dumps, before vmcore_info is set.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 		 * Mark as uneven to distinguish from real vmcore_info pointer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		S390_lowcore.vmcore_info = __kaslr_offset | 0x1UL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		/* Clear non-relocated kernel */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		if (IS_ENABLED(CONFIG_KERNEL_UNCOMPRESSED))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 			memset(img, 0, vmlinux.image_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	vmlinux.entry();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) }