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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2005 Yinghai Lu
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <compiler.h>
#include <console/console.h>
#include <cpu/cpu.h>
#include <arch/cpu.h>
#include <cpu/x86/cr.h>
#include <cpu/x86/msr.h>
#include <cpu/x86/pae.h>
#include <rules.h>
#include <string.h>
void paging_enable_pae_cr3(uintptr_t cr3)
{
/* Load the page table address */
write_cr3(cr3);
paging_enable_pae();
}
void paging_enable_pae(void)
{
CRx_TYPE cr0;
CRx_TYPE cr4;
/* Enable PAE */
cr4 = read_cr4();
cr4 |= CR4_PAE;
write_cr4(cr4);
/* Enable Paging */
cr0 = read_cr0();
cr0 |= CR0_PG;
write_cr0(cr0);
}
void paging_disable_pae(void)
{
CRx_TYPE cr0;
CRx_TYPE cr4;
/* Disable Paging */
cr0 = read_cr0();
cr0 &= ~(CRx_TYPE)CR0_PG;
write_cr0(cr0);
/* Disable PAE */
cr4 = read_cr4();
cr4 &= ~(CRx_TYPE)CR4_PAE;
write_cr4(cr4);
}
#if ENV_RAMSTAGE
void *map_2M_page(unsigned long page)
{
struct pde {
uint32_t addr_lo;
uint32_t addr_hi;
} __packed;
struct pg_table {
struct pde pd[2048];
struct pde pdp[512];
} __packed;
static struct pg_table pgtbl[CONFIG_MAX_CPUS]
__attribute__((aligned(4096)));
static unsigned long mapped_window[CONFIG_MAX_CPUS];
unsigned long index;
unsigned long window;
void *result;
int i;
index = cpu_index();
if (index >= CONFIG_MAX_CPUS)
return MAPPING_ERROR;
window = page >> 10;
if (window != mapped_window[index]) {
paging_disable_pae();
if (window > 1) {
struct pde *pd, *pdp;
/* Point the page directory pointers at the page
* directories
*/
memset(&pgtbl[index].pdp, 0, sizeof(pgtbl[index].pdp));
pd = pgtbl[index].pd;
pdp = pgtbl[index].pdp;
pdp[0].addr_lo = ((uint32_t)&pd[512*0])|1;
pdp[1].addr_lo = ((uint32_t)&pd[512*1])|1;
pdp[2].addr_lo = ((uint32_t)&pd[512*2])|1;
pdp[3].addr_lo = ((uint32_t)&pd[512*3])|1;
/* The first half of the page table is identity mapped
*/
for (i = 0; i < 1024; i++) {
pd[i].addr_lo = ((i & 0x3ff) << 21) | 0xE3;
pd[i].addr_hi = 0;
}
/* The second half of the page table holds the mapped
* page
*/
for (i = 1024; i < 2048; i++) {
pd[i].addr_lo = ((window & 1) << 31)
| ((i & 0x3ff) << 21) | 0xE3;
pd[i].addr_hi = (window >> 1);
}
paging_enable_pae_cr3((uintptr_t)pdp);
}
mapped_window[index] = window;
}
if (window == 0)
result = (void *)(page << 21);
else
result = (void *)(0x80000000 | ((page & 0x3ff) << 21));
return result;
}
#endif
void paging_set_nxe(int enable)
{
msr_t msr = rdmsr(IA32_EFER);
if (enable)
msr.lo |= EFER_NXE;
else
msr.lo &= ~EFER_NXE;
wrmsr(IA32_EFER, msr);
}
void paging_set_pat(uint64_t pat)
{
msr_t msr;
msr.lo = pat;
msr.hi = pat >> 32;
wrmsr(MSR_IA32_PAT, msr);
}
/* PAT encoding used in util/x86/x86_page_tables.go. It matches the linux
* kernel settings:
* PTE encoding:
* PAT
* |PCD
* ||PWT PAT
* ||| slot
* 000 0 WB : _PAGE_CACHE_MODE_WB
* 001 1 WC : _PAGE_CACHE_MODE_WC
* 010 2 UC-: _PAGE_CACHE_MODE_UC_MINUS
* 011 3 UC : _PAGE_CACHE_MODE_UC
* 100 4 WB : Reserved
* 101 5 WP : _PAGE_CACHE_MODE_WP
* 110 6 UC-: Reserved
* 111 7 WT : _PAGE_CACHE_MODE_WT
*/
void paging_set_default_pat(void)
{
uint64_t pat = PAT_ENCODE(WB, 0) | PAT_ENCODE(WC, 1) |
PAT_ENCODE(UC_MINUS, 2) | PAT_ENCODE(UC, 3) |
PAT_ENCODE(WB, 4) | PAT_ENCODE(WP, 5) |
PAT_ENCODE(UC_MINUS, 6) | PAT_ENCODE(WT, 7);
paging_set_pat(pat);
}
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