@@ -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();
}
@@ -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
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> --- 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(+) -- 2.20.1