static efi_status_t exit_boot_func(efi_system_table_t *sys_table_arg,
struct efi_boot_memmap *map,
void *priv)
{
struct exit_boot_struct *p = priv;
/*
* Update the memory map with virtual addresses. The function will also
* populate @runtime_map with copies of just the EFI_MEMORY_RUNTIME
* entries so that we can pass it straight to SetVirtualAddressMap()
*/
efi_get_virtmap(*map->map, *map->map_size, *map->desc_size,
p->runtime_map, p->runtime_entry_count);
return EFI_SUCCESS;
}
efi_status_t allocate_new_fdt_and_exit_boot(efi_system_table_t *sys_table,
void *handle,
unsigned long *new_fdt_addr,
unsigned long max_addr,
u64 initrd_addr, u64 initrd_size,
char *cmdline_ptr,
unsigned long fdt_addr,
unsigned long fdt_size)
{
unsigned long map_size, desc_size;
u32 desc_ver;
unsigned long mmap_key;
efi_memory_desc_t *memory_map, *runtime_map;
unsigned long new_fdt_size;
efi_status_t status;
int runtime_entry_count = 0;
/*
* Get a copy of the current memory map that we will use to prepare
* the input for SetVirtualAddressMap(). We don't have to worry about
* subsequent allocations adding entries, since they could not affect
* the number of EFI_MEMORY_RUNTIME regions.
*/
status = efi_get_memory_map(sys_table, &runtime_map, &map_size,
&desc_size, &desc_ver, &mmap_key);
if (status != EFI_SUCCESS) {
pr_efi_err(sys_table, "Unable to retrieve UEFI memory map.\n");
return status;
}
pr_efi(sys_table,
"Exiting boot services and installing virtual address map...\n");
/*
* Estimate size of new FDT, and allocate memory for it. We
* will allocate a bigger buffer if this ends up being too
* small, so a rough guess is OK here.
*/
new_fdt_size = fdt_size + EFI_PAGE_SIZE;
while (1) {
status = efi_high_alloc(sys_table, new_fdt_size, EFI_FDT_ALIGN,
new_fdt_addr, max_addr);
if (status != EFI_SUCCESS) {
pr_efi_err(sys_table, "Unable to allocate memory for new device tree.\n");
goto fail;
}
/*
* Now that we have done our final memory allocation (and free)
* we can get the memory map key needed for
* exit_boot_services().
*/
status = efi_get_memory_map(sys_table, &memory_map, &map_size,
&desc_size, &desc_ver, &mmap_key);
if (status != EFI_SUCCESS)
goto fail_free_new_fdt;
status = update_fdt(sys_table,
(void *)fdt_addr, fdt_size,
(void *)*new_fdt_addr, new_fdt_size,
cmdline_ptr, initrd_addr, initrd_size,
memory_map, map_size, desc_size, desc_ver);
/* Succeeding the first time is the expected case. */
if (status == EFI_SUCCESS)
break;
if (status == EFI_BUFFER_TOO_SMALL) {
/*
* We need to allocate more space for the new
* device tree, so free existing buffer that is
* too small. Also free memory map, as we will need
* to get new one that reflects the free/alloc we do
* on the device tree buffer.
*/
efi_free(sys_table, new_fdt_size, *new_fdt_addr);
sys_table->boottime->free_pool(memory_map);
new_fdt_size += EFI_PAGE_SIZE;
} else {
pr_efi_err(sys_table, "Unable to constuct new device tree.\n");
goto fail_free_mmap;
}
}
/*
* Update the memory map with virtual addresses. The function will also
* populate @runtime_map with copies of just the EFI_MEMORY_RUNTIME
* entries so that we can pass it straight into SetVirtualAddressMap()
*/
efi_get_virtmap(memory_map, map_size, desc_size, runtime_map,
&runtime_entry_count);
/* Now we are ready to exit_boot_services.*/
status = sys_table->boottime->exit_boot_services(handle, mmap_key);
if (status == EFI_SUCCESS) {
efi_set_virtual_address_map_t *svam;
/* Install the new virtual address map */
svam = sys_table->runtime->set_virtual_address_map;
status = svam(runtime_entry_count * desc_size, desc_size,
desc_ver, runtime_map);
/*
* We are beyond the point of no return here, so if the call to
* SetVirtualAddressMap() failed, we need to signal that to the
* incoming kernel but proceed normally otherwise.
*/
if (status != EFI_SUCCESS) {
int l;
/*
* Set the virtual address field of all
* EFI_MEMORY_RUNTIME entries to 0. This will signal
* the incoming kernel that no virtual translation has
* been installed.
*/
for (l = 0; l < map_size; l += desc_size) {
efi_memory_desc_t *p = (void *)memory_map + l;
if (p->attribute & EFI_MEMORY_RUNTIME)
p->virt_addr = 0;
}
}
return EFI_SUCCESS;
}
pr_efi_err(sys_table, "Exit boot services failed.\n");
fail_free_mmap:
sys_table->boottime->free_pool(memory_map);
fail_free_new_fdt:
efi_free(sys_table, new_fdt_size, *new_fdt_addr);
fail:
sys_table->boottime->free_pool(runtime_map);
return EFI_LOAD_ERROR;
}
