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SubjectRe: [tip:x86/boot] x86/boot: Early parse RSDP and save it in boot_params
On Mon, Feb 11, 2019 at 12:20:09PM +0100, Borislav Petkov wrote:
>On Mon, Feb 11, 2019 at 10:46:18AM +0000, Ard Biesheuvel wrote:
>> As I pointed out in my previous reply, systab will be the wrong type
>> on 32-bit firmware, it needs to be efi_system_table_32_t
>
>This seems to work. Chao, please run it too.

Ah, I will try and test more then reply to mail list.

Thanks,
Chao Fan

>
>Thx.
>
>---
>diff --git a/arch/x86/boot/compressed/acpi.c b/arch/x86/boot/compressed/acpi.c
>index c5a949335d8b..0d97aa8bd01f 100644
>--- a/arch/x86/boot/compressed/acpi.c
>+++ b/arch/x86/boot/compressed/acpi.c
>@@ -50,7 +50,8 @@ static acpi_physical_address efi_get_rsdp_addr(void)
> acpi_physical_address rsdp_addr = 0;
>
> #ifdef CONFIG_EFI
>- efi_system_table_t *systab;
>+ unsigned long systab, systab_tables, config_tables;
>+ unsigned int nr_tables;
> struct efi_info *ei;
> bool efi_64;
> int size, i;
>@@ -70,13 +71,13 @@ static acpi_physical_address efi_get_rsdp_addr(void)
>
> /* Get systab from boot params. */
> #ifdef CONFIG_X86_64
>- systab = (efi_system_table_t *)(ei->efi_systab | ((__u64)ei->efi_systab_hi<<32));
>+ systab = ei->efi_systab | ((__u64)ei->efi_systab_hi << 32);
> #else
> if (ei->efi_systab_hi || ei->efi_memmap_hi) {
> debug_putstr("Error getting RSDP address: EFI system table located above 4GB.\n");
> return 0;
> }
>- systab = (efi_system_table_t *)ei->efi_systab;
>+ systab = ei->efi_systab;
> #endif
> if (!systab)
> error("EFI system table not found.");
>@@ -87,16 +88,30 @@ static acpi_physical_address efi_get_rsdp_addr(void)
> size = efi_64 ? sizeof(efi_config_table_64_t) :
> sizeof(efi_config_table_32_t);
>
>- for (i = 0; i < systab->nr_tables; i++) {
>+ if (efi_64) {
>+ efi_system_table_64_t *st_tbl = (efi_system_table_64_t *)systab;
>+
>+ config_tables = st_tbl->tables;
>+ nr_tables = st_tbl->nr_tables;
>+ } else {
>+ efi_system_table_32_t *st_tbl = (efi_system_table_32_t *)systab;
>+
>+ config_tables = st_tbl->tables;
>+ nr_tables = st_tbl->nr_tables;
>+ }
>+
>+ if (!config_tables)
>+ error("EFI config tables not found.");
>+
>+ for (i = 0; i < nr_tables; i++) {
> acpi_physical_address table;
>- void *config_tables;
> efi_guid_t guid;
>
>- config_tables = (void *)(systab->tables + size * i);
>+ config_tables += size * i;
>+
> if (efi_64) {
>- efi_config_table_64_t *tmp_table;
>+ efi_config_table_64_t *tmp_table = (efi_config_table_64_t *)config_tables;
>
>- tmp_table = config_tables;
> guid = tmp_table->guid;
> table = tmp_table->table;
>
>@@ -105,9 +120,8 @@ static acpi_physical_address efi_get_rsdp_addr(void)
> return 0;
> }
> } else {
>- efi_config_table_32_t *tmp_table;
>+ efi_config_table_32_t *tmp_table = (efi_config_table_32_t *)config_tables;
>
>- tmp_table = config_tables;
> guid = tmp_table->guid;
> table = tmp_table->table;
> }
>
>--
>Regards/Gruss,
> Boris.
>
>Good mailing practices for 400: avoid top-posting and trim the reply.
>
>


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