Messages in this thread Patch in this message | | | From | Chao Fan <> | Subject | [PATCH v10 5/7] x86/boot: Add get_acpi_rsdp() to parse RSDP in cmdline from kexec | Date | Mon, 22 Oct 2018 17:37:18 +0800 |
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Imitate setup_acpi_rsdp() for the early_param of "acpi_rsdp". KEXEC writes the RSDP pointer to cmdline for EFI booting. So if "acpi_rsdp" found in cmdline, use it directely.
Signed-off-by: Chao Fan <fanc.fnst@cn.fujitsu.com> --- arch/x86/boot/compressed/acpitb.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+)
diff --git a/arch/x86/boot/compressed/acpitb.c b/arch/x86/boot/compressed/acpitb.c index 50fa65cf824d..fa63a584d7ec 100644 --- a/arch/x86/boot/compressed/acpitb.c +++ b/arch/x86/boot/compressed/acpitb.c @@ -8,6 +8,9 @@ #include <linux/numa.h> #include <linux/acpi.h> +#define STATIC +#include <linux/decompress/mm.h> + /* Search EFI table for RSDP table. */ static void efi_get_rsdp_addr(acpi_physical_address *rsdp_addr) { @@ -200,3 +203,23 @@ static void bios_get_rsdp_addr(acpi_physical_address *rsdp_addr) *rsdp_addr = (acpi_physical_address)address; } } + +static void get_acpi_rsdp(acpi_physical_address *rsdp_addr) +{ +#ifdef CONFIG_KEXEC + unsigned long long res; + int len = 0; + char *val; + + val = malloc(19); + len = cmdline_find_option("acpi_rsdp", val, 19); + + if (len == -1) + return; + + if (len > 0) { + val[len] = 0; + *rsdp_addr = (acpi_physical_address)kstrtoull(val, 16, &res); + } +#endif +} -- 2.17.2
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