1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
|
/* SPDX-License-Identifier: GPL-2.0-only */
#include <arch/cpu.h>
#include <cbmem.h>
#include <console/console.h>
#include <cpu/x86/cache.h>
#include <program_loading.h>
#include <types.h>
bool clflush_supported(void)
{
return (cpuid_edx(1) >> CPUID_FEATURE_CLFLUSH_BIT) & 1;
}
static void clflush_region(const uintptr_t start, const size_t size)
{
uintptr_t addr;
const size_t cl_size = ((cpuid_ebx(1) >> 8) & 0xff) * 8;
if (!clflush_supported()) {
printk(BIOS_DEBUG, "Not flushing cache to RAM, CLFLUSH not supported\n");
return;
}
printk(BIOS_SPEW, "CLFLUSH [0x%lx, 0x%lx]\n", start, start + size);
for (addr = ALIGN_DOWN(start, cl_size); addr < start + size; addr += cl_size)
clflush((void *)addr);
}
/*
* For each segment of a program loaded this function is called
* to invalidate caches for the addresses of the loaded segment
*/
void arch_segment_loaded(uintptr_t start, size_t size, int flags)
{
/* INVD is only called in postcar stage so we only need
to make sure that our code hits dram during romstage. */
if (!ENV_CACHE_AS_RAM)
return;
if (!ENV_ROMSTAGE)
return;
if (!CONFIG(POSTCAR_STAGE))
return;
if (!CONFIG(X86_CLFLUSH_CAR))
return;
if (flags != SEG_FINAL)
return;
/*
* The assumption is made here that DRAM is only ready after cbmem
* is initialized, to avoid flushing when loading earlier things (e.g. FSP, ...)
*/
if (!cbmem_online())
return;
clflush_region(start, size);
}
|
