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x86: Permit bootstage and timer data to be used prior to relocation

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It is useful to be able to access the timer before U-Boot has relocated
so that we can fully support bootstage.

Add new global_data members to support this.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2013-02-28 19:26:12 +00:00
parent 8937140957
commit bc2df1afb9
4 changed files with 16 additions and 18 deletions
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15
arch/x86/cpu/coreboot/coreboot.c
View File

@ -68,24 +68,21 @@ int board_early_init_r(void)
void show_boot_progress(int val)
{
#if MIN_PORT80_KCLOCKS_DELAY
static uint32_t prev_stamp;
static uint32_t base;
/*
* Scale the time counter reading to avoid using 64 bit arithmetics.
* Can't use get_timer() here becuase it could be not yet
* initialized or even implemented.
*/
if (!prev_stamp) {
base = rdtsc() / 1000;
prev_stamp = 0;
if (!gd->arch.tsc_prev) {
gd->arch.tsc_base_kclocks = rdtsc() / 1000;
gd->arch.tsc_prev = 0;
} else {
uint32_t now;
do {
now = rdtsc() / 1000 - base;
} while (now < (prev_stamp + MIN_PORT80_KCLOCKS_DELAY));
prev_stamp = now;
now = rdtsc() / 1000 - gd->arch.tsc_base_kclocks;
} while (now < (gd->arch.tsc_prev + MIN_PORT80_KCLOCKS_DELAY));
gd->arch.tsc_prev = now;
}
#endif
outb(val, 0x80);

7
arch/x86/cpu/interrupts.c
View File

@ -626,13 +626,12 @@ asm(".globl irq_common_entry\n" \
*/
u64 get_ticks(void)
{
static u64 tick_base;
u64 now_tick = rdtsc();
if (!tick_base)
tick_base = now_tick;
if (!gd->arch.tsc_base)
gd->arch.tsc_base = now_tick;
return now_tick - tick_base;
return now_tick - gd->arch.tsc_base;
}
#define PLATFORM_INFO_MSR 0xce

3
arch/x86/include/asm/global_data.h
View File

@ -29,6 +29,9 @@
/* Architecture-specific global data */
struct arch_global_data {
struct global_data *gd_addr; /* Location of Global Data */
uint64_t tsc_base; /* Initial value returned by rdtsc() */
uint32_t tsc_base_kclocks; /* Initial tsc as a kclocks value */
uint32_t tsc_prev; /* For show_boot_progress() */
};
#endif

9
arch/x86/lib/timer.c
View File

@ -37,7 +37,6 @@ struct timer_isr_function {
static struct timer_isr_function *first_timer_isr;
static unsigned long system_ticks;
static uint64_t base_value;
/*
* register_timer_isr() allows multiple architecture and board specific
@ -102,7 +101,7 @@ ulong get_timer(ulong base)
void timer_set_tsc_base(uint64_t new_base)
{
base_value = new_base;
gd->arch.tsc_base = new_base;
}
uint64_t timer_get_tsc(void)
@ -110,8 +109,8 @@ uint64_t timer_get_tsc(void)
uint64_t time_now;
time_now = rdtsc();
if (!base_value)
base_value = time_now;
if (!gd->arch.tsc_base)
gd->arch.tsc_base = time_now;
return time_now - base_value;
return time_now - gd->arch.tsc_base;
}