Slim Bootloader provides TSC clock information in its performance info hob. For now, TSC clock information is only used for timer driver from the performance info hob. - 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 Reviewed-by: Bin Meng bmeng.cn@gmail.com ---
Changes in v3: * Use HOB function from the common HOB library
arch/x86/cpu/slimbootloader/slimbootloader.c | 34 +++++++++++++++++++ .../asm/arch-slimbootloader/slimbootloader.h | 30 ++++++++++++++++ 2 files changed, 64 insertions(+)
diff --git a/arch/x86/cpu/slimbootloader/slimbootloader.c b/arch/x86/cpu/slimbootloader/slimbootloader.c index 9f3a61ec61..2153d2ac66 100644 --- a/arch/x86/cpu/slimbootloader/slimbootloader.c +++ b/arch/x86/cpu/slimbootloader/slimbootloader.c @@ -4,9 +4,43 @@ */
#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; + + if (!gd->arch.hob_list) + panic("hob list not found!"); + + gd->arch.tsc_base = rdtsc(); + debug("tsc_base=0x%llx\n", gd->arch.tsc_base); + + data = (struct performance_info *) + hob_get_guid_hob_data(gd->arch.hob_list, NULL, &guid); + + 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 5a0994544a..e0edbdddf5 100644 --- a/arch/x86/include/asm/arch-slimbootloader/slimbootloader.h +++ b/arch/x86/include/asm/arch-slimbootloader/slimbootloader.h @@ -27,6 +27,15 @@ { 0xbb, 0x98, 0x95, 0x8d, 0x62, 0xde, 0x87, 0xf1 } \ }
+/** + * A GUID to get boot performance info hob which is provided by Slim Bootloader + */ +#define LOADER_PERFORMANCE_INFO_GUID \ + { \ + 0x868204be, 0x23d0, 0x4ff9, \ + { 0xac, 0x34, 0xb9, 0x95, 0xac, 0x04, 0xb1, 0xb9 } \ + } + /** * A single entry of memory map information * @@ -71,6 +80,27 @@ struct serial_port_info { u32 rsvd1; } __packed;
+/** + * This includes timestamp data which has been collected in Slim Bootloader + * stages from the reset vector. In addition, this has TSC frequency in KHz to + * calculate each timestamp. + * + * @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 includes all memory map entries which is sorted based on physical start * address, from low to high, and carved out reserved, acpi nvs, acpi reclaim -- 2.20.1