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Atmosphere/exosphere/src/userpage.c

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#include <string.h>
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#include "utils.h"
#include "userpage.h"
#include "memory_map.h"
#include "cache.h"
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static uintptr_t g_user_page_user_address = 0ULL;
static inline uintptr_t get_page_for_address(void *address) {
return ((uintptr_t)(address)) & ~0xFFFULL;
}
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/* Create a user page reference for the desired address. */
/* Returns 1 on success, 0 on failure. */
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bool upage_init(upage_ref_t *upage, void *user_address) {
upage->user_address = get_page_for_address(user_address);
upage->secure_monitor_address = 0ULL;
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if (g_user_page_user_address != 0ULL) {
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/* Different physical address indicate SPL was rebooted, or another process got access to svcCallSecureMonitor. Panic. */
if (g_user_page_user_address != upage->user_address) {
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generic_panic();
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}
upage->secure_monitor_address = USER_PAGE_SECURE_MONITOR_ADDR;
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} else {
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/* Weakly validate SPL's physically random address is in DRAM. */
if (upage->user_address >> 31) {
static const uint64_t userpage_attributes = MMU_PTE_BLOCK_XN | MMU_PTE_BLOCK_INNER_SHAREBLE | MMU_PTE_BLOCK_NS | ATTRIB_MEMTYPE_NORMAL;
uintptr_t *mmu_l3_tbl = (uintptr_t *)tzram_get_segment_address(TZRAM_SEGMENT_ID_L3_TRANSLATION_TABLE);
g_user_page_user_address = upage->user_address;
mmu_map_page(mmu_l3_tbl, USER_PAGE_SECURE_MONITOR_ADDR, upage->user_address, userpage_attributes);
tlb_invalidate_page_inner_shareable((void *)USER_PAGE_SECURE_MONITOR_ADDR);
upage->secure_monitor_address = USER_PAGE_SECURE_MONITOR_ADDR;
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}
}
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return upage->secure_monitor_address != 0ULL;
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}
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bool user_copy_to_secure(upage_ref_t *upage, void *secure_dst, void *user_src, size_t size) {
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/* Fail if the page doesn't match. */
if (get_page_for_address(user_src) != upage->user_address) {
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return false;
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}
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/* Fail if we go past the page boundary. */
if (size != 0 && get_page_for_address(user_src + size - 1) != upage->user_address) {
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return false;
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}
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void *secure_src = (void *)(upage->secure_monitor_address + ((uintptr_t)user_src - upage->user_address));
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memcpy(secure_dst, secure_src, size);
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return true;
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}
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bool secure_copy_to_user(upage_ref_t *upage, void *user_dst, void *secure_src, size_t size) {
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/* Fail if the page doesn't match. */
if (get_page_for_address(user_dst) != upage->user_address) {
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return false;
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}
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/* Fail if we go past the page boundary. */
if (size != 0 && get_page_for_address(user_dst + size - 1) != upage->user_address) {
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return false;
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}
void *secure_dst = (void *)(upage->secure_monitor_address + ((uintptr_t)user_dst - upage->user_address));
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memcpy(secure_dst, secure_src, size);
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return true;
}