summaryrefslogtreecommitdiffstats
path: root/bsps/i386/shared/cache/cache.c
blob: f8358f22959105783d114716080b4a3c0a280f29 (plain) (blame)
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
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
/*
 *  Cache Management Support Routines for the i386
 */

#include <rtems.h>
#include <rtems/score/cpu.h>
#include <libcpu/page.h>

#define I386_CACHE_ALIGNMENT 16
#define CPU_DATA_CACHE_ALIGNMENT I386_CACHE_ALIGNMENT
#define CPU_INSTRUCTION_CACHE_ALIGNMENT I386_CACHE_ALIGNMENT

void _CPU_disable_cache(void)
{
  unsigned int regCr0;

  regCr0 = i386_get_cr0();
  regCr0 |= CR0_PAGE_LEVEL_CACHE_DISABLE;
  regCr0 |= CR0_NO_WRITE_THROUGH;
  i386_set_cr0( regCr0 );
  rtems_cache_flush_entire_data();
}

/*
 * Enable the entire cache
 */

void _CPU_enable_cache(void)
{
  unsigned int regCr0;

  regCr0 = i386_get_cr0();
  regCr0 &= ~(CR0_PAGE_LEVEL_CACHE_DISABLE);
  regCr0 &= ~(CR0_NO_WRITE_THROUGH);
  i386_set_cr0( regCr0 );
  /*rtems_cache_flush_entire_data();*/
}

/*
 * CACHE MANAGER: The following functions are CPU-specific.
 * They provide the basic implementation for the rtems_* cache
 * management routines. If a given function has no meaning for the CPU,
 * it does nothing by default.
 *
 * FIXME: The routines below should be implemented per CPU,
 *        to accomodate the capabilities of each.
 */

#if defined(I386_CACHE_ALIGNMENT)
static void _CPU_cache_flush_1_data_line(const void *d_addr) {}
static void _CPU_cache_invalidate_1_data_line(const void *d_addr) {}
static void _CPU_cache_freeze_data(void) {}
static void _CPU_cache_unfreeze_data(void) {}
static void _CPU_cache_flush_entire_data(void)
{
  __asm__ volatile ("wbinvd");
}
static void _CPU_cache_invalidate_entire_data(void)
{
  __asm__ volatile ("invd");
}

static void _CPU_cache_enable_data(void)
{
  _CPU_enable_cache();
}

static void _CPU_cache_disable_data(void)
{
  _CPU_disable_cache();
}

#endif

#include "../../../shared/cache/cacheimpl.h"