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// SPDX-License-Identifier: GPL-2.0
#include <linux/efi.h>
#include <linux/zstd.h>
#include <asm/efi.h>
#include "decompress_sources.h"
#include "efistub.h"
extern unsigned char _gzdata_start[], _gzdata_end[];
extern u32 __aligned(1) payload_size;
static size_t wksp_size;
static void *wksp;
efi_status_t efi_zboot_decompress_init(unsigned long *alloc_size)
{
efi_status_t status;
wksp_size = zstd_dctx_workspace_bound();
status = efi_allocate_pages(wksp_size, (unsigned long *)&wksp, ULONG_MAX);
if (status != EFI_SUCCESS)
return status;
*alloc_size = payload_size;
return EFI_SUCCESS;
}
efi_status_t efi_zboot_decompress(u8 *out, unsigned long outlen)
{
zstd_dctx *dctx = zstd_init_dctx(wksp, wksp_size);
size_t ret;
int retval;
ret = zstd_decompress_dctx(dctx, out, outlen, _gzdata_start,
_gzdata_end - _gzdata_start - 4);
efi_free(wksp_size, (unsigned long)wksp);
retval = zstd_get_error_code(ret);
if (retval) {
efi_err("ZSTD-decompression failed with status %d\n", retval);
return EFI_LOAD_ERROR;
}
efi_cache_sync_image((unsigned long)out, outlen);
return EFI_SUCCESS;
}
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