diff options
Diffstat (limited to 'arch/x86/boot/compressed')
| -rw-r--r-- | arch/x86/boot/compressed/acpi.c | 143 | ||||
| -rw-r--r-- | arch/x86/boot/compressed/eboot.c | 10 | ||||
| -rw-r--r-- | arch/x86/boot/compressed/head_32.S | 4 | ||||
| -rw-r--r-- | arch/x86/boot/compressed/head_64.S | 19 | ||||
| -rw-r--r-- | arch/x86/boot/compressed/misc.c | 12 | ||||
| -rw-r--r-- | arch/x86/boot/compressed/misc.h | 1 | ||||
| -rw-r--r-- | arch/x86/boot/compressed/pgtable_64.c | 14 |
7 files changed, 139 insertions, 64 deletions
diff --git a/arch/x86/boot/compressed/acpi.c b/arch/x86/boot/compressed/acpi.c index e726e9b44bb1..149795c369f2 100644 --- a/arch/x86/boot/compressed/acpi.c +++ b/arch/x86/boot/compressed/acpi.c @@ -44,17 +44,109 @@ static acpi_physical_address get_cmdline_acpi_rsdp(void) return addr; } -/* Search EFI system tables for RSDP. */ -static acpi_physical_address efi_get_rsdp_addr(void) +/* + * Search EFI system tables for RSDP. If both ACPI_20_TABLE_GUID and + * ACPI_TABLE_GUID are found, take the former, which has more features. + */ +static acpi_physical_address +__efi_get_rsdp_addr(unsigned long config_tables, unsigned int nr_tables, + bool efi_64) { acpi_physical_address rsdp_addr = 0; #ifdef CONFIG_EFI - unsigned long systab, systab_tables, config_tables; + int i; + + /* Get EFI tables from systab. */ + for (i = 0; i < nr_tables; i++) { + acpi_physical_address table; + efi_guid_t guid; + + if (efi_64) { + efi_config_table_64_t *tbl = (efi_config_table_64_t *)config_tables + i; + + guid = tbl->guid; + table = tbl->table; + + if (!IS_ENABLED(CONFIG_X86_64) && table >> 32) { + debug_putstr("Error getting RSDP address: EFI config table located above 4GB.\n"); + return 0; + } + } else { + efi_config_table_32_t *tbl = (efi_config_table_32_t *)config_tables + i; + + guid = tbl->guid; + table = tbl->table; + } + + if (!(efi_guidcmp(guid, ACPI_TABLE_GUID))) + rsdp_addr = table; + else if (!(efi_guidcmp(guid, ACPI_20_TABLE_GUID))) + return table; + } +#endif + return rsdp_addr; +} + +/* EFI/kexec support is 64-bit only. */ +#ifdef CONFIG_X86_64 +static struct efi_setup_data *get_kexec_setup_data_addr(void) +{ + struct setup_data *data; + u64 pa_data; + + pa_data = boot_params->hdr.setup_data; + while (pa_data) { + data = (struct setup_data *)pa_data; + if (data->type == SETUP_EFI) + return (struct efi_setup_data *)(pa_data + sizeof(struct setup_data)); + + pa_data = data->next; + } + return NULL; +} + +static acpi_physical_address kexec_get_rsdp_addr(void) +{ + efi_system_table_64_t *systab; + struct efi_setup_data *esd; + struct efi_info *ei; + char *sig; + + esd = (struct efi_setup_data *)get_kexec_setup_data_addr(); + if (!esd) + return 0; + + if (!esd->tables) { + debug_putstr("Wrong kexec SETUP_EFI data.\n"); + return 0; + } + + ei = &boot_params->efi_info; + sig = (char *)&ei->efi_loader_signature; + if (strncmp(sig, EFI64_LOADER_SIGNATURE, 4)) { + debug_putstr("Wrong kexec EFI loader signature.\n"); + return 0; + } + + /* Get systab from boot params. */ + systab = (efi_system_table_64_t *) (ei->efi_systab | ((__u64)ei->efi_systab_hi << 32)); + if (!systab) + error("EFI system table not found in kexec boot_params."); + + return __efi_get_rsdp_addr((unsigned long)esd->tables, systab->nr_tables, true); +} +#else +static acpi_physical_address kexec_get_rsdp_addr(void) { return 0; } +#endif /* CONFIG_X86_64 */ + +static acpi_physical_address efi_get_rsdp_addr(void) +{ +#ifdef CONFIG_EFI + unsigned long systab, config_tables; unsigned int nr_tables; struct efi_info *ei; bool efi_64; - int size, i; char *sig; ei = &boot_params->efi_info; @@ -88,49 +180,20 @@ static acpi_physical_address efi_get_rsdp_addr(void) config_tables = stbl->tables; nr_tables = stbl->nr_tables; - size = sizeof(efi_config_table_64_t); } else { efi_system_table_32_t *stbl = (efi_system_table_32_t *)systab; config_tables = stbl->tables; nr_tables = stbl->nr_tables; - size = sizeof(efi_config_table_32_t); } if (!config_tables) error("EFI config tables not found."); - /* Get EFI tables from systab. */ - for (i = 0; i < nr_tables; i++) { - acpi_physical_address table; - efi_guid_t guid; - - config_tables += size; - - if (efi_64) { - efi_config_table_64_t *tbl = (efi_config_table_64_t *)config_tables; - - guid = tbl->guid; - table = tbl->table; - - if (!IS_ENABLED(CONFIG_X86_64) && table >> 32) { - debug_putstr("Error getting RSDP address: EFI config table located above 4GB.\n"); - return 0; - } - } else { - efi_config_table_32_t *tbl = (efi_config_table_32_t *)config_tables; - - guid = tbl->guid; - table = tbl->table; - } - - if (!(efi_guidcmp(guid, ACPI_TABLE_GUID))) - rsdp_addr = table; - else if (!(efi_guidcmp(guid, ACPI_20_TABLE_GUID))) - return table; - } + return __efi_get_rsdp_addr(config_tables, nr_tables, efi_64); +#else + return 0; #endif - return rsdp_addr; } static u8 compute_checksum(u8 *buffer, u32 length) @@ -217,6 +280,14 @@ acpi_physical_address get_rsdp_addr(void) pa = boot_params->acpi_rsdp_addr; + /* + * Try to get EFI data from setup_data. This can happen when we're a + * kexec'ed kernel and kexec(1) has passed all the required EFI info to + * us. + */ + if (!pa) + pa = kexec_get_rsdp_addr(); + if (!pa) pa = efi_get_rsdp_addr(); diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c index 220d1279d0e2..d6662fdef300 100644 --- a/arch/x86/boot/compressed/eboot.c +++ b/arch/x86/boot/compressed/eboot.c @@ -384,14 +384,11 @@ struct boot_params *make_boot_params(struct efi_config *c) struct apm_bios_info *bi; struct setup_header *hdr; efi_loaded_image_t *image; - void *options, *handle; + void *handle; efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID; int options_size = 0; efi_status_t status; char *cmdline_ptr; - u16 *s2; - u8 *s1; - int i; unsigned long ramdisk_addr; unsigned long ramdisk_size; @@ -494,8 +491,6 @@ static void add_e820ext(struct boot_params *params, struct setup_data *e820ext, u32 nr_entries) { struct setup_data *data; - efi_status_t status; - unsigned long size; e820ext->type = SETUP_E820_EXT; e820ext->len = nr_entries * sizeof(struct boot_e820_entry); @@ -677,8 +672,6 @@ static efi_status_t exit_boot_func(efi_system_table_t *sys_table_arg, void *priv) { const char *signature; - __u32 nr_desc; - efi_status_t status; struct exit_boot_struct *p = priv; signature = efi_is_64bit() ? EFI64_LOADER_SIGNATURE @@ -747,7 +740,6 @@ struct boot_params * efi_main(struct efi_config *c, struct boot_params *boot_params) { struct desc_ptr *gdt = NULL; - efi_loaded_image_t *image; struct setup_header *hdr = &boot_params->hdr; efi_status_t status; struct desc_struct *desc; diff --git a/arch/x86/boot/compressed/head_32.S b/arch/x86/boot/compressed/head_32.S index 37380c0d5999..5e30eaaf8576 100644 --- a/arch/x86/boot/compressed/head_32.S +++ b/arch/x86/boot/compressed/head_32.S @@ -140,7 +140,7 @@ ENTRY(startup_32) /* * Jump to the relocated address. */ - leal relocated(%ebx), %eax + leal .Lrelocated(%ebx), %eax jmp *%eax ENDPROC(startup_32) @@ -209,7 +209,7 @@ ENDPROC(efi32_stub_entry) #endif .text -relocated: +.Lrelocated: /* * Clear BSS (stack is currently empty) diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S index fafb75c6c592..d98cd483377e 100644 --- a/arch/x86/boot/compressed/head_64.S +++ b/arch/x86/boot/compressed/head_64.S @@ -87,7 +87,7 @@ ENTRY(startup_32) call verify_cpu testl %eax, %eax - jnz no_longmode + jnz .Lno_longmode /* * Compute the delta between where we were compiled to run at @@ -322,7 +322,7 @@ ENTRY(startup_64) 1: popq %rdi subq $1b, %rdi - call adjust_got + call .Ladjust_got /* * At this point we are in long mode with 4-level paging enabled, @@ -421,7 +421,7 @@ trampoline_return: /* The new adjustment is the relocation address */ movq %rbx, %rdi - call adjust_got + call .Ladjust_got /* * Copy the compressed kernel to the end of our buffer @@ -440,7 +440,7 @@ trampoline_return: /* * Jump to the relocated address. */ - leaq relocated(%rbx), %rax + leaq .Lrelocated(%rbx), %rax jmp *%rax #ifdef CONFIG_EFI_STUB @@ -511,7 +511,7 @@ ENDPROC(efi64_stub_entry) #endif .text -relocated: +.Lrelocated: /* * Clear BSS (stack is currently empty) @@ -548,7 +548,7 @@ relocated: * first time we touch GOT). * RDI is the new adjustment to apply. */ -adjust_got: +.Ladjust_got: /* Walk through the GOT adding the address to the entries */ leaq _got(%rip), %rdx leaq _egot(%rip), %rcx @@ -622,7 +622,7 @@ ENTRY(trampoline_32bit_src) movl %eax, %cr4 /* Calculate address of paging_enabled() once we are executing in the trampoline */ - leal paging_enabled - trampoline_32bit_src + TRAMPOLINE_32BIT_CODE_OFFSET(%ecx), %eax + leal .Lpaging_enabled - trampoline_32bit_src + TRAMPOLINE_32BIT_CODE_OFFSET(%ecx), %eax /* Prepare the stack for far return to Long Mode */ pushl $__KERNEL_CS @@ -635,7 +635,7 @@ ENTRY(trampoline_32bit_src) lret .code64 -paging_enabled: +.Lpaging_enabled: /* Return from the trampoline */ jmp *%rdi @@ -647,7 +647,7 @@ paging_enabled: .org trampoline_32bit_src + TRAMPOLINE_32BIT_CODE_SIZE .code32 -no_longmode: +.Lno_longmode: /* This isn't an x86-64 CPU, so hang intentionally, we cannot continue */ 1: hlt @@ -659,6 +659,7 @@ no_longmode: gdt64: .word gdt_end - gdt .quad 0 + .balign 8 gdt: .word gdt_end - gdt .long gdt diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c index 5a237e8dbf8d..53ac0cb2396d 100644 --- a/arch/x86/boot/compressed/misc.c +++ b/arch/x86/boot/compressed/misc.c @@ -17,6 +17,7 @@ #include "pgtable.h" #include "../string.h" #include "../voffset.h" +#include <asm/bootparam_utils.h> /* * WARNING!! @@ -351,9 +352,6 @@ asmlinkage __visible void *extract_kernel(void *rmode, memptr heap, /* Clear flags intended for solely in-kernel use. */ boot_params->hdr.loadflags &= ~KASLR_FLAG; - /* Save RSDP address for later use. */ - /* boot_params->acpi_rsdp_addr = get_rsdp_addr(); */ - sanitize_boot_params(boot_params); if (boot_params->screen_info.orig_video_mode == 7) { @@ -368,6 +366,14 @@ asmlinkage __visible void *extract_kernel(void *rmode, memptr heap, cols = boot_params->screen_info.orig_video_cols; console_init(); + + /* + * Save RSDP address for later use. Have this after console_init() + * so that early debugging output from the RSDP parsing code can be + * collected. + */ + boot_params->acpi_rsdp_addr = get_rsdp_addr(); + debug_putstr("early console in extract_kernel\n"); free_mem_ptr = heap; /* Heap */ diff --git a/arch/x86/boot/compressed/misc.h b/arch/x86/boot/compressed/misc.h index d2f184165934..c8181392f70d 100644 --- a/arch/x86/boot/compressed/misc.h +++ b/arch/x86/boot/compressed/misc.h @@ -23,7 +23,6 @@ #include <asm/page.h> #include <asm/boot.h> #include <asm/bootparam.h> -#include <asm/bootparam_utils.h> #define BOOT_CTYPE_H #include <linux/acpi.h> diff --git a/arch/x86/boot/compressed/pgtable_64.c b/arch/x86/boot/compressed/pgtable_64.c index f8debf7aeb4c..c8862696a47b 100644 --- a/arch/x86/boot/compressed/pgtable_64.c +++ b/arch/x86/boot/compressed/pgtable_64.c @@ -40,7 +40,6 @@ int cmdline_find_option_bool(const char *option); static unsigned long find_trampoline_placement(void) { unsigned long bios_start = 0, ebda_start = 0; - unsigned long trampoline_start; struct boot_e820_entry *entry; char *signature; int i; @@ -73,6 +72,8 @@ static unsigned long find_trampoline_placement(void) /* Find the first usable memory region under bios_start. */ for (i = boot_params->e820_entries - 1; i >= 0; i--) { + unsigned long new = bios_start; + entry = &boot_params->e820_table[i]; /* Skip all entries above bios_start. */ @@ -85,15 +86,20 @@ static unsigned long find_trampoline_placement(void) /* Adjust bios_start to the end of the entry if needed. */ if (bios_start > entry->addr + entry->size) - bios_start = entry->addr + entry->size; + new = entry->addr + entry->size; /* Keep bios_start page-aligned. */ - bios_start = round_down(bios_start, PAGE_SIZE); + new = round_down(new, PAGE_SIZE); /* Skip the entry if it's too small. */ - if (bios_start - TRAMPOLINE_32BIT_SIZE < entry->addr) + if (new - TRAMPOLINE_32BIT_SIZE < entry->addr) continue; + /* Protect against underflow. */ + if (new - TRAMPOLINE_32BIT_SIZE > bios_start) + break; + + bios_start = new; break; } |