- Get TSC frequency from performance info hob - Set tsc_base and clock_rate for timer driver
Signed-off-by: Aiden Park aiden.park@intel.com --- arch/x86/cpu/slimbootloader/slimbootloader.c | 31 +++++++++++++++++++ .../asm/arch-slimbootloader/slimbootloader.h | 26 ++++++++++++++++ 2 files changed, 57 insertions(+)
diff --git a/arch/x86/cpu/slimbootloader/slimbootloader.c b/arch/x86/cpu/slimbootloader/slimbootloader.c index 9f3a61ec61..e2bab99461 100644 --- a/arch/x86/cpu/slimbootloader/slimbootloader.c +++ b/arch/x86/cpu/slimbootloader/slimbootloader.c @@ -4,9 +4,40 @@ */
#include <common.h> +#include <asm/arch/slimbootloader.h> + +DECLARE_GLOBAL_DATA_PTR; + +/** + * This sets tsc_base and clock_rate for early_timer and tsc_timer. + * The performance info guid hob has all performance timestamp data, but + * the only tsc frequency info is used for the timer driver for now. + */ +static void tsc_init(void) +{ + struct performance_info *data = NULL; + const struct efi_guid guid = LOADER_PERFORMANCE_INFO_GUID; + + gd->arch.tsc_base = rdtsc(); + debug("tsc_base=0x%llx\n", gd->arch.tsc_base); + + data = (struct performance_info *) + get_next_guid_hob_data(&guid, gd->arch.hob_list); + + if (!data) { + debug("performance info hob not found\n"); + return; + } + + /* frequency is in KHz, so to Hz */ + gd->arch.clock_rate = data->frequency * 1000; + debug("freq=0x%lx\n", gd->arch.clock_rate); +}
int arch_cpu_init(void) { + tsc_init(); + return x86_cpu_init_f(); }
diff --git a/arch/x86/include/asm/arch-slimbootloader/slimbootloader.h b/arch/x86/include/asm/arch-slimbootloader/slimbootloader.h index b05e527148..0b908f7c3e 100644 --- a/arch/x86/include/asm/arch-slimbootloader/slimbootloader.h +++ b/arch/x86/include/asm/arch-slimbootloader/slimbootloader.h @@ -22,6 +22,12 @@ { 0xbb, 0x98, 0x95, 0x8d, 0x62, 0xde, 0x87, 0xf1 } \ }
+#define LOADER_PERFORMANCE_INFO_GUID \ + { \ + 0x868204be, 0x23d0, 0x4ff9, \ + { 0xac, 0x34, 0xb9, 0x95, 0xac, 0x04, 0xb1, 0xb9 } \ + } + /** * A single entry of memory map information * @@ -81,6 +87,26 @@ struct serial_port_info { u32 rsvd1; } __packed;
+/** + * This includes timestamp data which has been collected + * in Slim Bootloader stages. + * + * @rev : revision of performance_info structure. currently 1. + * @rsvd : padding for alignment + * @count : the number of collected timestamp data + * @flags : only used in Slim Bootloader + * @frequency: tsc frequency in KHz + * @timestamp: the array of timestamp data which has 64-bit tsc value + */ +struct performance_info { + u8 rev; + u8 rsvd[3]; + u16 count; + u16 flags; + u32 frequency; + u64 timestamp[0]; +} __packed; + /** * This returns a pointer to hob data buffer if the given guid hob is found. *