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exo: add extension smc to write to user address

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This commit is contained in:
Michael Scire 2019-05-28 02:56:15 -07:00
parent 79d96bbdfd
commit 40b838c896
3 changed files with 73 additions and 0 deletions
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66
exosphere/src/smc_ams.c
View file

@ -155,3 +155,69 @@ uint32_t ams_iram_copy(smc_args_t *args) {
return 0;
}
uint32_t ams_write_address(smc_args_t *args) {
/* Implements a write to a DRAM page. */
/* This operation can be used to write to read-only pages. */
/* args->X[1] = DRAM address (translated by kernel), must be size-bytes aligned. */
/* args->X[2] = Value. */
/* args->X[3] = size (must be 1, 2, 4, or 8). */
const uintptr_t dram_address = (uintptr_t)args->X[1];
const uintptr_t dram_page_offset = (dram_address & 0xFFFULL);
const size_t size = (size_t)(args->X[3]);
/* Validate addresses. */
if (!ams_is_user_addr_valid(dram_address)) {
return 2;
}
/* Validate size. */
switch (size) {
case 1:
case 2:
case 4:
case 8:
if ((size + dram_page_offset) > 0x1000) {
return 2;
}
break;
default:
return 2;
}
/* Validate alignment. */
if (dram_page_offset % size) {
return 2;
}
/* Map pages. */
ams_map_userpage(dram_address);
/* Write data. */
uintptr_t dram_ptr = (uintptr_t)(AMS_USER_PAGE_SECURE_MONITOR_ADDR + dram_page_offset);
switch (size) {
case 1:
*((volatile uint8_t *)dram_ptr) = (uint8_t)(args->X[2]);
break;
case 2:
*((volatile uint16_t *)dram_ptr) = (uint16_t)(args->X[2]);
break;
case 4:
*((volatile uint32_t *)dram_ptr) = (uint32_t)(args->X[2]);
break;
case 8:
*((volatile uint64_t *)dram_ptr) = args->X[2];
break;
default:
generic_panic();
}
/* Flush! */
flush_dcache_range((void *)dram_ptr, (void *)(dram_ptr + size));
/* Unmap pages. */
ams_unmap_userpage();
return 0;
}

1
exosphere/src/smc_ams.h
View file

@ -20,6 +20,7 @@
#include "smc_api.h"
uint32_t ams_iram_copy(smc_args_t *args);
uint32_t ams_write_address(smc_args_t *args);
void ams_map_irampage(uintptr_t iram_address);
void ams_unmap_irampage(void);

6
exosphere/src/smc_api.c
View file

@ -77,6 +77,7 @@ uint32_t smc_read_write_register(smc_args_t *args);
/* Atmosphere SMC prototypes */
uint32_t smc_ams_iram_copy(smc_args_t *args);
uint32_t smc_ams_write_address(smc_args_t *args);
/* TODO: Provide a way to set this. It's 0 on non-recovery boot anyway... */
static uint32_t g_smc_blacklist_mask = 0;
@ -133,6 +134,7 @@ static smc_table_entry_t g_smc_ams_table[] = {
{0, 4, NULL},
{0xF0000201, 0, smc_ams_iram_copy},
{0xF0000002, 0, smc_read_write_register},
{0xF0000203, 0, smc_ams_write_address},
};
#define SMC_AMS_HANDLERS (sizeof(g_smc_ams_table) / sizeof(g_smc_ams_table[0]))
@ -718,3 +720,7 @@ uint32_t smc_panic(smc_args_t *args) {
uint32_t smc_ams_iram_copy(smc_args_t *args) {
return smc_wrapper_sync(args, ams_iram_copy);
}
uint32_t smc_ams_write_address(smc_args_t *args) {
return smc_wrapper_sync(args, ams_write_address);
}