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Subject[PATCH 3/7] Change EFI helper APIs to be more flexible
Date
* Change the EFI helper functions to be more flexible to allow their use
by other architectures.
* Pass system table pointer as argument to all functions that use it,
rather than use a global variable.
* Change name of __get_map to efi_get_memory_map, and add key pointer argument
so it can be used to get final memory map before the EFI exitBootServices()
function is called.
* Change the handle_ramdisks() to handle_cmdline_files(), and make it more
generic by taking string to match rather than hardcoding 'initrd='
so it can be used to load device tree files as well.
* Add 'min' address parameter to limit low_alloc() alloctions
* Fix type of chunksize to match EFI function (not checked in x86 code
as wrappers break type checking.)
* rename alloc/free functions - low_free() is usable by both low_alloc()
and high_alloc(), so rename them to be more consistent - efi_low_alloc()
efi_high_alloc(), and efi_free()
* Enforce minimum pagesize alignment as expected by EFI allocate_pages().
* check for 0 size in efi_free.


Signed-off-by: Roy Franz <roy.franz@linaro.org>
---
arch/x86/boot/compressed/eboot.c | 46 ++++----
drivers/firmware/efi/efi-stub-helper.c | 181 ++++++++++++++++++++------------
2 files changed, 140 insertions(+), 87 deletions(-)

diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c
index ab0eefc..d15cf47 100644
--- a/arch/x86/boot/compressed/eboot.c
+++ b/arch/x86/boot/compressed/eboot.c
@@ -443,6 +443,8 @@ struct boot_params *make_boot_params(void *handle, efi_system_table_t *_table)
u16 *s2;
u8 *s1;
int i;
+ u64 ramdisk_addr;
+ u64 ramdisk_size;

sys_table = _table;

@@ -453,13 +455,14 @@ struct boot_params *make_boot_params(void *handle, efi_system_table_t *_table)
status = efi_call_phys3(sys_table->boottime->handle_protocol,
handle, &proto, (void *)&image);
if (status != EFI_SUCCESS) {
- efi_printk("Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
+ efi_printk(sys_table, "Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
return NULL;
}

- status = low_alloc(0x4000, 1, (unsigned long *)&boot_params);
+ status = efi_low_alloc(sys_table, 0x4000, 1,
+ (unsigned long *)&boot_params, 0);
if (status != EFI_SUCCESS) {
- efi_printk("Failed to alloc lowmem for boot params\n");
+ efi_printk(sys_table, "Failed to alloc lowmem for boot params\n");
return NULL;
}

@@ -503,9 +506,10 @@ struct boot_params *make_boot_params(void *handle, efi_system_table_t *_table)

options_size++; /* NUL termination */

- status = low_alloc(options_size, 1, &cmdline);
+ status = efi_low_alloc(sys_table, options_size, 1,
+ &cmdline, 0);
if (status != EFI_SUCCESS) {
- efi_printk("Failed to alloc mem for cmdline\n");
+ efi_printk(sys_table, "Failed to alloc mem for cmdline\n");
goto fail;
}

@@ -529,16 +533,21 @@ struct boot_params *make_boot_params(void *handle, efi_system_table_t *_table)

memset(sdt, 0, sizeof(*sdt));

- status = handle_ramdisks(image, hdr);
+ status = handle_cmdline_files(sys_table, image,
+ (char *)(unsigned long)hdr->cmd_line_ptr,
+ "initrd=", hdr->initrd_addr_max,
+ &ramdisk_addr, &ramdisk_size);
if (status != EFI_SUCCESS)
goto fail2;
+ hdr->ramdisk_image = ramdisk_addr;
+ hdr->ramdisk_size = ramdisk_size;

return boot_params;
fail2:
if (options_size)
- low_free(options_size, hdr->cmd_line_ptr);
+ efi_free(sys_table, options_size, hdr->cmd_line_ptr);
fail:
- low_free(0x4000, (unsigned long)boot_params);
+ efi_free(sys_table, 0x4000, (unsigned long)boot_params);
return NULL;
}

@@ -561,7 +570,7 @@ static efi_status_t exit_boot(struct boot_params *boot_params,
again:
size += sizeof(*mem_map) * 2;
_size = size;
- status = low_alloc(size, 1, (unsigned long *)&mem_map);
+ status = efi_low_alloc(sys_table, size, 1, (unsigned long *)&mem_map, 0);
if (status != EFI_SUCCESS)
return status;

@@ -569,7 +578,7 @@ get_map:
status = efi_call_phys5(sys_table->boottime->get_memory_map, &size,
mem_map, &key, &desc_size, &desc_version);
if (status == EFI_BUFFER_TOO_SMALL) {
- low_free(_size, (unsigned long)mem_map);
+ efi_free(sys_table, _size, (unsigned long)mem_map);
goto again;
}

@@ -671,7 +680,7 @@ get_map:
return EFI_SUCCESS;

free_mem_map:
- low_free(_size, (unsigned long)mem_map);
+ efi_free(sys_table, _size, (unsigned long)mem_map);
return status;
}

@@ -694,10 +703,10 @@ static efi_status_t relocate_kernel(struct setup_header *hdr)
EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
nr_pages, &start);
if (status != EFI_SUCCESS) {
- status = low_alloc(hdr->init_size, hdr->kernel_alignment,
- &start);
+ status = efi_low_alloc(sys_table, hdr->init_size,
+ hdr->kernel_alignment, &start, 0);
if (status != EFI_SUCCESS)
- efi_printk("Failed to alloc mem for kernel\n");
+ efi_printk(sys_table, "Failed to alloc mem for kernel\n");
}

if (status == EFI_SUCCESS)
@@ -737,14 +746,15 @@ struct boot_params *efi_main(void *handle, efi_system_table_t *_table,
EFI_LOADER_DATA, sizeof(*gdt),
(void **)&gdt);
if (status != EFI_SUCCESS) {
- efi_printk("Failed to alloc mem for gdt structure\n");
+ efi_printk(sys_table, "Failed to alloc mem for gdt structure\n");
goto fail;
}

gdt->size = 0x800;
- status = low_alloc(gdt->size, 8, (unsigned long *)&gdt->address);
+ status = efi_low_alloc(sys_table, gdt->size, 8,
+ (unsigned long *)&gdt->address, 0);
if (status != EFI_SUCCESS) {
- efi_printk("Failed to alloc mem for gdt\n");
+ efi_printk(sys_table, "Failed to alloc mem for gdt\n");
goto fail;
}

@@ -752,7 +762,7 @@ struct boot_params *efi_main(void *handle, efi_system_table_t *_table,
EFI_LOADER_DATA, sizeof(*idt),
(void **)&idt);
if (status != EFI_SUCCESS) {
- efi_printk("Failed to alloc mem for idt structure\n");
+ efi_printk(sys_table, "Failed to alloc mem for idt structure\n");
goto fail;
}

diff --git a/drivers/firmware/efi/efi-stub-helper.c b/drivers/firmware/efi/efi-stub-helper.c
index 47891bd..3dd9b76 100644
--- a/drivers/firmware/efi/efi-stub-helper.c
+++ b/drivers/firmware/efi/efi-stub-helper.c
@@ -11,6 +11,8 @@
*/


+#define EFI_READ_CHUNK_SIZE (1024 * 1024)
+
struct initrd {
efi_file_handle_t *handle;
u64 size;
@@ -19,15 +21,16 @@ struct initrd {



-static void efi_char16_printk(efi_char16_t *str)
+static void efi_char16_printk(efi_system_table_t *sys_table_arg,
+ efi_char16_t *str)
{
struct efi_simple_text_output_protocol *out;

- out = (struct efi_simple_text_output_protocol *)sys_table->con_out;
+ out = (struct efi_simple_text_output_protocol *)sys_table_arg->con_out;
efi_call_phys2(out->output_string, out, str);
}

-static void efi_printk(char *str)
+static void efi_printk(efi_system_table_t *sys_table_arg, char *str)
{
char *s8;

@@ -37,16 +40,19 @@ static void efi_printk(char *str)
ch[0] = *s8;
if (*s8 == '\n') {
efi_char16_t nl[2] = { '\r', 0 };
- efi_char16_printk(nl);
+ efi_char16_printk(sys_table_arg, nl);
}

- efi_char16_printk(ch);
+ efi_char16_printk(sys_table_arg, ch);
}
}


-static efi_status_t __get_map(efi_memory_desc_t **map, unsigned long *map_size,
- unsigned long *desc_size)
+static efi_status_t efi_get_memory_map(efi_system_table_t *sys_table_arg,
+ efi_memory_desc_t **map,
+ unsigned long *map_size,
+ unsigned long *desc_size,
+ unsigned long *key_ptr)
{
efi_memory_desc_t *m = NULL;
efi_status_t status;
@@ -60,20 +66,22 @@ again:
* allocation which may be in a new descriptor region.
*/
*map_size += sizeof(*m);
- status = efi_call_phys3(sys_table->boottime->allocate_pool,
+ status = efi_call_phys3(sys_table_arg->boottime->allocate_pool,
EFI_LOADER_DATA, *map_size, (void **)&m);
if (status != EFI_SUCCESS)
goto fail;

- status = efi_call_phys5(sys_table->boottime->get_memory_map, map_size,
- m, &key, desc_size, &desc_version);
+ status = efi_call_phys5(sys_table_arg->boottime->get_memory_map,
+ map_size, m, &key, desc_size, &desc_version);
if (status == EFI_BUFFER_TOO_SMALL) {
- efi_call_phys1(sys_table->boottime->free_pool, m);
+ efi_call_phys1(sys_table_arg->boottime->free_pool, m);
goto again;
}

if (status != EFI_SUCCESS)
- efi_call_phys1(sys_table->boottime->free_pool, m);
+ efi_call_phys1(sys_table_arg->boottime->free_pool, m);
+ if (key_ptr && status == EFI_SUCCESS)
+ *key_ptr = key;

fail:
*map = m;
@@ -83,8 +91,9 @@ fail:
/*
* Allocate at the highest possible address that is not above 'max'.
*/
-static efi_status_t high_alloc(unsigned long size, unsigned long align,
- unsigned long *addr, unsigned long max)
+static efi_status_t efi_high_alloc(efi_system_table_t *sys_table_arg,
+ unsigned long size, unsigned long align,
+ unsigned long *addr, unsigned long max)
{
unsigned long map_size, desc_size;
efi_memory_desc_t *map;
@@ -93,10 +102,18 @@ static efi_status_t high_alloc(unsigned long size, unsigned long align,
u64 max_addr = 0;
int i;

- status = __get_map(&map, &map_size, &desc_size);
+ status = efi_get_memory_map(sys_table_arg, &map, &map_size, &desc_size,
+ NULL);
if (status != EFI_SUCCESS)
goto fail;

+ /* Enforce minimum alignment that EFI requires when requesting
+ * a specific address. We are doing page-based allocations,
+ * so we must be aligned to a page.
+ */
+ if (align < EFI_PAGE_SIZE)
+ align = EFI_PAGE_SIZE;
+
nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
again:
for (i = 0; i < map_size / desc_size; i++) {
@@ -139,7 +156,7 @@ again:
if (!max_addr)
status = EFI_NOT_FOUND;
else {
- status = efi_call_phys4(sys_table->boottime->allocate_pages,
+ status = efi_call_phys4(sys_table_arg->boottime->allocate_pages,
EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
nr_pages, &max_addr);
if (status != EFI_SUCCESS) {
@@ -151,18 +168,18 @@ again:
*addr = max_addr;
}

-free_pool:
- efi_call_phys1(sys_table->boottime->free_pool, map);
+ efi_call_phys1(sys_table_arg->boottime->free_pool, map);

fail:
return status;
}

/*
- * Allocate at the lowest possible address.
+ * Allocate at the lowest possible address, that is not below 'min'
*/
-static efi_status_t low_alloc(unsigned long size, unsigned long align,
- unsigned long *addr)
+static efi_status_t efi_low_alloc(efi_system_table_t *sys_table_arg,
+ unsigned long size, unsigned long align,
+ unsigned long *addr, unsigned long min)
{
unsigned long map_size, desc_size;
efi_memory_desc_t *map;
@@ -170,16 +187,23 @@ static efi_status_t low_alloc(unsigned long size, unsigned long align,
unsigned long nr_pages;
int i;

- status = __get_map(&map, &map_size, &desc_size);
+ status = efi_get_memory_map(sys_table_arg, &map, &map_size, &desc_size,
+ NULL);
if (status != EFI_SUCCESS)
goto fail;

+ /* Enforce minimum alignment that EFI requires when requesting
+ * a specific address. We are doing page-based allocations,
+ * so we must be aligned to a page.
+ */
+ if (align < EFI_PAGE_SIZE)
+ align = EFI_PAGE_SIZE;
+
nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
for (i = 0; i < map_size / desc_size; i++) {
efi_memory_desc_t *desc;
unsigned long m = (unsigned long)map;
u64 start, end;
-
desc = (efi_memory_desc_t *)(m + (i * desc_size));

if (desc->type != EFI_CONVENTIONAL_MEMORY)
@@ -199,11 +223,14 @@ static efi_status_t low_alloc(unsigned long size, unsigned long align,
if (start == 0x0)
start += 8;

+ if (start < min)
+ start = min;
+
start = round_up(start, align);
if ((start + size) > end)
continue;

- status = efi_call_phys4(sys_table->boottime->allocate_pages,
+ status = efi_call_phys4(sys_table_arg->boottime->allocate_pages,
EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
nr_pages, &start);
if (status == EFI_SUCCESS) {
@@ -215,18 +242,21 @@ static efi_status_t low_alloc(unsigned long size, unsigned long align,
if (i == map_size / desc_size)
status = EFI_NOT_FOUND;

-free_pool:
- efi_call_phys1(sys_table->boottime->free_pool, map);
+ efi_call_phys1(sys_table_arg->boottime->free_pool, map);
fail:
return status;
}

-static void low_free(unsigned long size, unsigned long addr)
+static void efi_free(efi_system_table_t *sys_table_arg, unsigned long size,
+ unsigned long addr)
{
unsigned long nr_pages;

+ if (!size)
+ return;
+
nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
- efi_call_phys2(sys_table->boottime->free_pages, addr, nr_pages);
+ efi_call_phys2(sys_table_arg->boottime->free_pages, addr, nr_pages);
}


@@ -236,8 +266,11 @@ static void low_free(unsigned long size, unsigned long addr)
* We only support loading an initrd from the same filesystem as the
* kernel image.
*/
-static efi_status_t handle_ramdisks(efi_loaded_image_t *image,
- struct setup_header *hdr)
+static efi_status_t handle_cmdline_files(efi_system_table_t *sys_table_arg,
+ efi_loaded_image_t *image,
+ char *cmd_line, char *option_string,
+ u64 max_addr,
+ u64 *load_addr, u64 *load_size)
{
struct initrd *initrds;
unsigned long initrd_addr;
@@ -253,19 +286,25 @@ static efi_status_t handle_ramdisks(efi_loaded_image_t *image,
initrd_addr = 0;
initrd_total = 0;

- str = (char *)(unsigned long)hdr->cmd_line_ptr;
+ str = cmd_line;

j = 0; /* See close_handles */

+ if (!load_addr || !load_size)
+ return EFI_INVALID_PARAMETER;
+
+ *load_addr = 0;
+ *load_size = 0;
+
if (!str || !*str)
return EFI_SUCCESS;

for (nr_initrds = 0; *str; nr_initrds++) {
- str = strstr(str, "initrd=");
+ str = strstr(str, option_string);
if (!str)
break;

- str += 7;
+ str += strlen(option_string);

/* Skip any leading slashes */
while (*str == '/' || *str == '\\')
@@ -278,16 +317,16 @@ static efi_status_t handle_ramdisks(efi_loaded_image_t *image,
if (!nr_initrds)
return EFI_SUCCESS;

- status = efi_call_phys3(sys_table->boottime->allocate_pool,
+ status = efi_call_phys3(sys_table_arg->boottime->allocate_pool,
EFI_LOADER_DATA,
nr_initrds * sizeof(*initrds),
- &initrds);
+ (void **)&initrds);
if (status != EFI_SUCCESS) {
- efi_printk("Failed to alloc mem for initrds\n");
+ efi_printk(sys_table_arg, "Failed to alloc mem for file load\n");
goto fail;
}

- str = (char *)(unsigned long)hdr->cmd_line_ptr;
+ str = cmd_line;
for (i = 0; i < nr_initrds; i++) {
struct initrd *initrd;
efi_file_handle_t *h;
@@ -298,11 +337,11 @@ static efi_status_t handle_ramdisks(efi_loaded_image_t *image,
efi_char16_t *p;
u64 file_sz;

- str = strstr(str, "initrd=");
+ str = strstr(str, option_string);
if (!str)
break;

- str += 7;
+ str += strlen(option_string);

initrd = &initrds[i];
p = filename_16;
@@ -317,7 +356,7 @@ static efi_status_t handle_ramdisks(efi_loaded_image_t *image,

if (*str == '/') {
*p++ = '\\';
- *str++;
+ str++;
} else {
*p++ = *str++;
}
@@ -329,18 +368,19 @@ static efi_status_t handle_ramdisks(efi_loaded_image_t *image,
if (!i) {
efi_boot_services_t *boottime;

- boottime = sys_table->boottime;
+ boottime = sys_table_arg->boottime;

status = efi_call_phys3(boottime->handle_protocol,
- image->device_handle, &fs_proto, &io);
+ image->device_handle, &fs_proto,
+ (void **)&io);
if (status != EFI_SUCCESS) {
- efi_printk("Failed to handle fs_proto\n");
+ efi_printk(sys_table_arg, "Failed to handle fs_proto\n");
goto free_initrds;
}

status = efi_call_phys2(io->open_volume, io, &fh);
if (status != EFI_SUCCESS) {
- efi_printk("Failed to open volume\n");
+ efi_printk(sys_table_arg, "Failed to open volume\n");
goto free_initrds;
}
}
@@ -348,9 +388,9 @@ static efi_status_t handle_ramdisks(efi_loaded_image_t *image,
status = efi_call_phys5(fh->open, fh, &h, filename_16,
EFI_FILE_MODE_READ, (u64)0);
if (status != EFI_SUCCESS) {
- efi_printk("Failed to open initrd file: ");
- efi_char16_printk(filename_16);
- efi_printk("\n");
+ efi_printk(sys_table_arg, "Failed to open file file: ");
+ efi_char16_printk(sys_table_arg, filename_16);
+ efi_printk(sys_table_arg, "\n");
goto close_handles;
}

@@ -360,30 +400,32 @@ static efi_status_t handle_ramdisks(efi_loaded_image_t *image,
status = efi_call_phys4(h->get_info, h, &info_guid,
&info_sz, NULL);
if (status != EFI_BUFFER_TOO_SMALL) {
- efi_printk("Failed to get initrd info size\n");
+ efi_printk(sys_table_arg, "Failed to get file info size\n");
goto close_handles;
}

grow:
- status = efi_call_phys3(sys_table->boottime->allocate_pool,
- EFI_LOADER_DATA, info_sz, &info);
+ status = efi_call_phys3(sys_table_arg->boottime->allocate_pool,
+ EFI_LOADER_DATA, info_sz,
+ (void **)&info);
if (status != EFI_SUCCESS) {
- efi_printk("Failed to alloc mem for initrd info\n");
+ efi_printk(sys_table_arg, "Failed to alloc mem for file info\n");
goto close_handles;
}

status = efi_call_phys4(h->get_info, h, &info_guid,
&info_sz, info);
if (status == EFI_BUFFER_TOO_SMALL) {
- efi_call_phys1(sys_table->boottime->free_pool, info);
+ efi_call_phys1(sys_table_arg->boottime->free_pool,
+ info);
goto grow;
}

file_sz = info->file_size;
- efi_call_phys1(sys_table->boottime->free_pool, info);
+ efi_call_phys1(sys_table_arg->boottime->free_pool, info);

if (status != EFI_SUCCESS) {
- efi_printk("Failed to get initrd info\n");
+ efi_printk(sys_table_arg, "Failed to get file info\n");
goto close_handles;
}

@@ -399,16 +441,16 @@ grow:
* addresses in memory, so allocate enough memory for
* all the initrd's.
*/
- status = high_alloc(initrd_total, 0x1000,
- &initrd_addr, hdr->initrd_addr_max);
+ status = efi_high_alloc(sys_table_arg, initrd_total, 0x1000,
+ &initrd_addr, max_addr);
if (status != EFI_SUCCESS) {
- efi_printk("Failed to alloc highmem for initrds\n");
+ efi_printk(sys_table_arg, "Failed to alloc highmem for initrds\n");
goto close_handles;
}

/* We've run out of free low memory. */
- if (initrd_addr > hdr->initrd_addr_max) {
- efi_printk("We've run out of free low memory\n");
+ if (initrd_addr > max_addr) {
+ efi_printk(sys_table_arg, "We've run out of free low memory\n");
status = EFI_INVALID_PARAMETER;
goto free_initrd_total;
}
@@ -419,16 +461,17 @@ grow:

size = initrds[j].size;
while (size) {
- u64 chunksize;
+ unsigned long chunksize;
if (size > EFI_READ_CHUNK_SIZE)
chunksize = EFI_READ_CHUNK_SIZE;
else
chunksize = size;
status = efi_call_phys3(fh->read,
initrds[j].handle,
- &chunksize, addr);
+ &chunksize,
+ (void *)addr);
if (status != EFI_SUCCESS) {
- efi_printk("Failed to read initrd\n");
+ efi_printk(sys_table_arg, "Failed to read file\n");
goto free_initrd_total;
}
addr += chunksize;
@@ -440,24 +483,24 @@ grow:

}

- efi_call_phys1(sys_table->boottime->free_pool, initrds);
+ efi_call_phys1(sys_table_arg->boottime->free_pool, initrds);

- hdr->ramdisk_image = initrd_addr;
- hdr->ramdisk_size = initrd_total;
+ *load_addr = initrd_addr;
+ *load_size = initrd_total;

return status;

free_initrd_total:
- low_free(initrd_total, initrd_addr);
+ efi_free(sys_table_arg, initrd_total, initrd_addr);

close_handles:
for (k = j; k < i; k++)
efi_call_phys1(fh->close, initrds[k].handle);
free_initrds:
- efi_call_phys1(sys_table->boottime->free_pool, initrds);
+ efi_call_phys1(sys_table_arg->boottime->free_pool, initrds);
fail:
- hdr->ramdisk_image = 0;
- hdr->ramdisk_size = 0;
+ *load_addr = 0;
+ *load_size = 0;

return status;
}
--
1.7.10.4


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