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hw/loader: split out load_image_gzipped_buffer()

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In the next patch we'd like to reuse the image decompression facility
without installing the output as a ROM at a specific guest-phys address.

In addition, expose LOAD_IMAGE_MAX_GUNZIP_BYTES, because that's a
straightforward "max_sz" argument for the new load_image_gzipped_buffer().

Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 1419250305-31062-10-git-send-email-pbonzini@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Laszlo Ersek 2014-12-22 13:11:43 +01:00 committed by Peter Maydell
parent 578f3c7b08
commit 7d48a0f721
2 changed files with 30 additions and 9 deletions
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30
hw/core/loader.c
View File

@ -614,14 +614,9 @@ int load_ramdisk(const char *filename, hwaddr addr, uint64_t max_sz)
NULL, NULL);
}
/* 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)
/* Load a gzip-compressed kernel to a dynamically allocated buffer. */
int load_image_gzipped_buffer(const char *filename, uint64_t max_sz,
uint8_t **buffer)
{
uint8_t *compressed_data = NULL;
uint8_t *data = NULL;
@ -653,8 +648,11 @@ int load_image_gzipped(const char *filename, hwaddr addr, uint64_t max_sz)
goto out;
}
rom_add_blob_fixed(filename, data, bytes, addr);
/* trim to actual size and return to caller */
*buffer = g_realloc(data, bytes);
ret = bytes;
/* ownership has been transferred to caller */
data = NULL;
out:
g_free(compressed_data);
@ -662,6 +660,20 @@ int load_image_gzipped(const char *filename, hwaddr addr, uint64_t max_sz)
return ret;
}
/* Load a gzip-compressed kernel. */
int load_image_gzipped(const char *filename, hwaddr addr, uint64_t max_sz)
{
int bytes;
uint8_t *data;
bytes = load_image_gzipped_buffer(filename, max_sz, &data);
if (bytes != -1) {
rom_add_blob_fixed(filename, data, bytes, addr);
g_free(data);
}
return bytes;
}
/*
* Functions for reboot-persistent memory regions.
* - used for vga bios and option roms.

9
include/hw/loader.h
View File

@ -16,6 +16,15 @@ int load_image(const char *filename, uint8_t *addr); /* deprecated */
ssize_t load_image_size(const char *filename, void *addr, size_t size);
int load_image_targphys(const char *filename, hwaddr,
uint64_t max_sz);
/* This is the limit on the maximum uncompressed image size that
* load_image_gzipped_buffer() and load_image_gzipped() will read. It prevents
* g_malloc() in those functions from allocating a huge amount of memory.
*/
#define LOAD_IMAGE_MAX_GUNZIP_BYTES (256 << 20)
int load_image_gzipped_buffer(const char *filename, uint64_t max_sz,
uint8_t **buffer);
int load_image_gzipped(const char *filename, hwaddr addr, uint64_t max_sz);
#define ELF_LOAD_FAILED -1