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/*
* This file is part of the libpayload project.
*
* Copyright (C) 2008 coresystems GmbH
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <libpayload.h>
#include <assert.h>
#include <die.h>
#include <stdlib.h>
#include <unistd.h>
#include <arch/cache.h>
#include <arch/virtual.h>
#include <arch/io.h>
unsigned long virtual_offset = 0;
extern char _end[];
/*
* MAIR Index
* (Originally defined in src/arch/arm/include/armv7/arch/cache.h)
*/
#define MAIR_INDX_NC 0
#define MAIR_INDX_WT 1
#define MAIR_INDX_WB 2
/*
* Translation Table Attribute
* (Originally defined in src/arch/arm/include/armv7/arch/cache.h)
*/
#define ATTR_BASE (\
0ULL << 54 | /* PN. 0:Not restricted */ \
0ULL << 53 | /* PXN. 0:Not restricted */ \
1 << 10 | /* AF. 1:Accessed. This is to prevent access \
* fault when accessed for the first time */ \
0 << 6 | /* AP[2:1]. 0b00:full access from PL1 */ \
0 << 5 | /* NS. 0:Output address is in Secure space */ \
0 << 1 | /* block/table. 0:block entry */ \
1 << 0 /* validity. 1:valid */ \
)
#define ATTR_NC (ATTR_BASE | (MAIR_INDX_NC << 2))
#define ATTR_WT (ATTR_BASE | (MAIR_INDX_WT << 2))
#define ATTR_WB (ATTR_BASE | (MAIR_INDX_WB << 2))
/* Translation Table Entry */
typedef uint64_t pmd_t;
typedef uint64_t pgd_t;
#define SECTION_SHIFT 30
#define BLOCK_SHIFT 21
#define PAGE_SHIFT 12
#define PGD_MASK (~0 << PAGE_SHIFT)
static pmd_t *ttb_buff = 0;
static uintptr_t work_block;
static pmd_t original_map;
int getpagesize(void)
{
return 1 << PAGE_SHIFT;
}
static void lpae_map_init(void)
{
pgd_t *pgd;
die_if(!(read_ttbcr() >> 31), "LPAE is not enabled\n");
/* get work block address */
work_block = ALIGN_UP((uintptr_t)_end, 2*MiB);
assert(work_block);
printf("Work block for LPAE mapping is @ %p\n", (void *)work_block);
/* get the address of the 1st pmd from pgd[0] */
pgd = (pgd_t *)((uintptr_t)read_ttbr0() & PGD_MASK);
ttb_buff = (pmd_t *)((uintptr_t)pgd[0] & PGD_MASK);
assert(ttb_buff);
original_map = ttb_buff[work_block >> BLOCK_SHIFT];
}
static void lpae_flush_work_block(void)
{
dccmvac((uintptr_t)&ttb_buff[work_block >> BLOCK_SHIFT]);
dsb();
tlbimvaa(work_block);
dsb();
isb();
}
/**
* Maps a 2MB designated block to a requested physical address, and returns
* the address to the block or NULL on error.
*
* pa_mb: Physical address in MB. Has to be on a 2MB boundary.
* policy: Data chache policy
*/
void *lpae_map_phys_addr(unsigned long pa_mb, enum dcache_policy policy)
{
pmd_t attr;
if (!ttb_buff)
lpae_map_init();
switch(policy) {
case DCACHE_OFF:
attr = ATTR_NC;
break;
case DCACHE_WRITEBACK:
attr = ATTR_WB;
break;
case DCACHE_WRITETHROUGH:
attr = ATTR_WT;
break;
default:
return NULL;
}
ttb_buff[work_block >> BLOCK_SHIFT] =
((pmd_t)pa_mb/2 << BLOCK_SHIFT) | attr;
lpae_flush_work_block();
return (void *)work_block;
}
void lpae_restore_map(void)
{
ttb_buff[work_block >> BLOCK_SHIFT] = original_map;
lpae_flush_work_block();
}
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