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---
r: 158667
b: refs/heads/master
c: 6c4caa1
h: refs/heads/master
i:
  158665: 46e8eee
  158663: 7c75238
v: v3
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Jaswinder Singh Rajput authored and Ingo Molnar committed Jul 4, 2009
1 parent bf891be commit 81c54e8
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Showing 2 changed files with 36 additions and 134 deletions.
2 changes: 1 addition & 1 deletion [refs]
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@@ -1,2 +1,2 @@
---
refs/heads/master: 42204455f160dab0c47f19e1be23f5c927af2d17
refs/heads/master: 6c4caa1ab737502190e416b76e6c10d2bf24276a
168 changes: 35 additions & 133 deletions trunk/arch/x86/kernel/cpu/mtrr/centaur.c
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Original file line number Diff line number Diff line change
@@ -1,7 +1,9 @@
#include <linux/init.h>
#include <linux/mm.h>

#include <asm/mtrr.h>
#include <asm/msr.h>

#include "mtrr.h"

static struct {
Expand All @@ -12,37 +14,40 @@ static struct {
static u8 centaur_mcr_reserved;
static u8 centaur_mcr_type; /* 0 for winchip, 1 for winchip2 */

/*
* Report boot time MCR setups
/**
* centaur_get_free_region - Get a free MTRR.
*
* @base: The starting (base) address of the region.
* @size: The size (in bytes) of the region.
*
* Returns: the index of the region on success, else -1 on error.
*/

static int
centaur_get_free_region(unsigned long base, unsigned long size, int replace_reg)
/* [SUMMARY] Get a free MTRR.
<base> The starting (base) address of the region.
<size> The size (in bytes) of the region.
[RETURNS] The index of the region on success, else -1 on error.
*/
{
int i, max;
mtrr_type ltype;
unsigned long lbase, lsize;
mtrr_type ltype;
int i, max;

max = num_var_ranges;
if (replace_reg >= 0 && replace_reg < max)
return replace_reg;

for (i = 0; i < max; ++i) {
if (centaur_mcr_reserved & (1 << i))
continue;
mtrr_if->get(i, &lbase, &lsize, &ltype);
if (lsize == 0)
return i;
}

return -ENOSPC;
}

void
mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi)
/*
* Report boot time MCR setups
*/
void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi)
{
centaur_mcr[mcr].low = lo;
centaur_mcr[mcr].high = hi;
Expand All @@ -54,160 +59,59 @@ centaur_get_mcr(unsigned int reg, unsigned long *base,
{
*base = centaur_mcr[reg].high >> PAGE_SHIFT;
*size = -(centaur_mcr[reg].low & 0xfffff000) >> PAGE_SHIFT;
*type = MTRR_TYPE_WRCOMB; /* If it is there, it is write-combining */
*type = MTRR_TYPE_WRCOMB; /* write-combining */

if (centaur_mcr_type == 1 && ((centaur_mcr[reg].low & 31) & 2))
*type = MTRR_TYPE_UNCACHABLE;
if (centaur_mcr_type == 1 && (centaur_mcr[reg].low & 31) == 25)
*type = MTRR_TYPE_WRBACK;
if (centaur_mcr_type == 0 && (centaur_mcr[reg].low & 31) == 31)
*type = MTRR_TYPE_WRBACK;

}

static void centaur_set_mcr(unsigned int reg, unsigned long base,
unsigned long size, mtrr_type type)
static void
centaur_set_mcr(unsigned int reg, unsigned long base,
unsigned long size, mtrr_type type)
{
unsigned long low, high;

if (size == 0) {
/* Disable */
/* Disable */
high = low = 0;
} else {
high = base << PAGE_SHIFT;
if (centaur_mcr_type == 0)
low = -size << PAGE_SHIFT | 0x1f; /* only support write-combining... */
else {
if (centaur_mcr_type == 0) {
/* Only support write-combining... */
low = -size << PAGE_SHIFT | 0x1f;
} else {
if (type == MTRR_TYPE_UNCACHABLE)
low = -size << PAGE_SHIFT | 0x02; /* NC */
low = -size << PAGE_SHIFT | 0x02; /* NC */
else
low = -size << PAGE_SHIFT | 0x09; /* WWO,WC */
low = -size << PAGE_SHIFT | 0x09; /* WWO, WC */
}
}
centaur_mcr[reg].high = high;
centaur_mcr[reg].low = low;
wrmsr(MSR_IDT_MCR0 + reg, low, high);
}

#if 0
/*
* Initialise the later (saner) Winchip MCR variant. In this version
* the BIOS can pass us the registers it has used (but not their values)
* and the control register is read/write
*/

static void __init
centaur_mcr1_init(void)
{
unsigned i;
u32 lo, hi;

/* Unfortunately, MCR's are read-only, so there is no way to
* find out what the bios might have done.
*/

rdmsr(MSR_IDT_MCR_CTRL, lo, hi);
if (((lo >> 17) & 7) == 1) { /* Type 1 Winchip2 MCR */
lo &= ~0x1C0; /* clear key */
lo |= 0x040; /* set key to 1 */
wrmsr(MSR_IDT_MCR_CTRL, lo, hi); /* unlock MCR */
}

centaur_mcr_type = 1;

/*
* Clear any unconfigured MCR's.
*/

for (i = 0; i < 8; ++i) {
if (centaur_mcr[i].high == 0 && centaur_mcr[i].low == 0) {
if (!(lo & (1 << (9 + i))))
wrmsr(MSR_IDT_MCR0 + i, 0, 0);
else
/*
* If the BIOS set up an MCR we cannot see it
* but we don't wish to obliterate it
*/
centaur_mcr_reserved |= (1 << i);
}
}
/*
* Throw the main write-combining switch...
* However if OOSTORE is enabled then people have already done far
* cleverer things and we should behave.
*/

lo |= 15; /* Write combine enables */
wrmsr(MSR_IDT_MCR_CTRL, lo, hi);
}

/*
* Initialise the original winchip with read only MCR registers
* no used bitmask for the BIOS to pass on and write only control
*/

static void __init
centaur_mcr0_init(void)
{
unsigned i;

/* Unfortunately, MCR's are read-only, so there is no way to
* find out what the bios might have done.
*/

/* Clear any unconfigured MCR's.
* This way we are sure that the centaur_mcr array contains the actual
* values. The disadvantage is that any BIOS tweaks are thus undone.
*
*/
for (i = 0; i < 8; ++i) {
if (centaur_mcr[i].high == 0 && centaur_mcr[i].low == 0)
wrmsr(MSR_IDT_MCR0 + i, 0, 0);
}

wrmsr(MSR_IDT_MCR_CTRL, 0x01F0001F, 0); /* Write only */
}

/*
* Initialise Winchip series MCR registers
*/

static void __init
centaur_mcr_init(void)
{
struct set_mtrr_context ctxt;

set_mtrr_prepare_save(&ctxt);
set_mtrr_cache_disable(&ctxt);

if (boot_cpu_data.x86_model == 4)
centaur_mcr0_init();
else if (boot_cpu_data.x86_model == 8 || boot_cpu_data.x86_model == 9)
centaur_mcr1_init();

set_mtrr_done(&ctxt);
}
#endif

static int centaur_validate_add_page(unsigned long base,
unsigned long size, unsigned int type)
static int
centaur_validate_add_page(unsigned long base, unsigned long size, unsigned int type)
{
/*
* FIXME: Winchip2 supports uncached
* FIXME: Winchip2 supports uncached
*/
if (type != MTRR_TYPE_WRCOMB &&
if (type != MTRR_TYPE_WRCOMB &&
(centaur_mcr_type == 0 || type != MTRR_TYPE_UNCACHABLE)) {
printk(KERN_WARNING
"mtrr: only write-combining%s supported\n",
centaur_mcr_type ? " and uncacheable are"
: " is");
pr_warning("mtrr: only write-combining%s supported\n",
centaur_mcr_type ? " and uncacheable are" : " is");
return -EINVAL;
}
return 0;
}

static struct mtrr_ops centaur_mtrr_ops = {
.vendor = X86_VENDOR_CENTAUR,
// .init = centaur_mcr_init,
.set = centaur_set_mcr,
.get = centaur_get_mcr,
.get_free_region = centaur_get_free_region,
Expand All @@ -220,5 +124,3 @@ int __init centaur_init_mtrr(void)
set_mtrr_ops(&centaur_mtrr_ops);
return 0;
}

//arch_initcall(centaur_init_mtrr);

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