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loader: Add load_image_gzipped function.

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As the name suggests this lets you load a ROM/disk image that is
gzipped.  It is uncompressed before storing it in guest memory.

Signed-off-by: Richard W.M. Jones <rjones@redhat.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-id: 1407831259-2115-2-git-send-email-rjones@redhat.com
[PMM: removed stray space before ')']
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard W.M. Jones 2014-08-19 18:56:28 +01:00 committed by Peter Maydell
parent f7838b5290
commit 235e74afcb
2 changed files with 49 additions and 0 deletions
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48
hw/core/loader.c
View File

@ -577,6 +577,54 @@ int load_ramdisk(const char *filename, hwaddr addr, uint64_t max_sz)
return load_uboot_image(filename, NULL, &addr, NULL, IH_TYPE_RAMDISK);
}
/* This simply prevents g_malloc in the function below from allocating
* a huge amount of memory, by placing a limit on the maximum
* uncompressed image size that load_image_gzipped will read.
*/
#define LOAD_IMAGE_MAX_GUNZIP_BYTES (256 << 20)
/* Load a gzip-compressed kernel. */
int load_image_gzipped(const char *filename, hwaddr addr, uint64_t max_sz)
{
uint8_t *compressed_data = NULL;
uint8_t *data = NULL;
gsize len;
ssize_t bytes;
int ret = -1;
if (!g_file_get_contents(filename, (char **) &compressed_data, &len,
NULL)) {
goto out;
}
/* Is it a gzip-compressed file? */
if (len < 2 ||
compressed_data[0] != 0x1f ||
compressed_data[1] != 0x8b) {
goto out;
}
if (max_sz > LOAD_IMAGE_MAX_GUNZIP_BYTES) {
max_sz = LOAD_IMAGE_MAX_GUNZIP_BYTES;
}
data = g_malloc(max_sz);
bytes = gunzip(data, max_sz, compressed_data, len);
if (bytes < 0) {
fprintf(stderr, "%s: unable to decompress gzipped kernel file\n",
filename);
goto out;
}
rom_add_blob_fixed(filename, data, bytes, addr);
ret = bytes;
out:
g_free(compressed_data);
g_free(data);
return ret;
}
/*
* Functions for reboot-persistent memory regions.
* - used for vga bios and option roms.

1
include/hw/loader.h
View File

@ -15,6 +15,7 @@ int get_image_size(const char *filename);
int load_image(const char *filename, uint8_t *addr); /* deprecated */
int load_image_targphys(const char *filename, hwaddr,
uint64_t max_sz);
int load_image_gzipped(const char *filename, hwaddr addr, uint64_t max_sz);
#define ELF_LOAD_FAILED -1
#define ELF_LOAD_NOT_ELF -2