diff options
| -rw-r--r-- | arch/x86/boot/Makefile | 2 | ||||
| -rw-r--r-- | arch/x86/boot/compressed/mkpiggy.c | 21 | ||||
| -rw-r--r-- | arch/x86/boot/header.S | 35 |
3 files changed, 30 insertions, 28 deletions
diff --git a/arch/x86/boot/Makefile b/arch/x86/boot/Makefile index b1ef9e489084..942f7dabfb1e 100644 --- a/arch/x86/boot/Makefile +++ b/arch/x86/boot/Makefile @@ -95,7 +95,7 @@ targets += voffset.h $(obj)/voffset.h: vmlinux FORCE $(call if_changed,voffset) -sed-zoffset := -e 's/^\([0-9a-fA-F]*\) [ABCDGRSTVW] \(startup_32\|startup_64\|efi32_stub_entry\|efi64_stub_entry\|efi_pe_entry\|input_data\|_end\|z_.*\)$$/\#define ZO_\2 0x\1/p' +sed-zoffset := -e 's/^\([0-9a-fA-F]*\) [ABCDGRSTVW] \(startup_32\|startup_64\|efi32_stub_entry\|efi64_stub_entry\|efi_pe_entry\|input_data\|_end\|_ehead\|_text\|z_.*\)$$/\#define ZO_\2 0x\1/p' quiet_cmd_zoffset = ZOFFSET $@ cmd_zoffset = $(NM) $< | sed -n $(sed-zoffset) > $@ diff --git a/arch/x86/boot/compressed/mkpiggy.c b/arch/x86/boot/compressed/mkpiggy.c index b980046c3329..f095ed9e7d3c 100644 --- a/arch/x86/boot/compressed/mkpiggy.c +++ b/arch/x86/boot/compressed/mkpiggy.c @@ -18,11 +18,10 @@ * * H. Peter Anvin <hpa@linux.intel.com> * - * ----------------------------------------------------------------------- */ - -/* - * Compute the desired load offset from a compressed program; outputs - * a small assembly wrapper with the appropriate symbols defined. + * ----------------------------------------------------------------------- + * + * Outputs a small assembly wrapper with the appropriate symbols defined. + * */ #include <stdlib.h> @@ -35,7 +34,6 @@ int main(int argc, char *argv[]) { uint32_t olen; long ilen; - unsigned long offs; unsigned long run_size; FILE *f = NULL; int retval = 1; @@ -67,15 +65,6 @@ int main(int argc, char *argv[]) ilen = ftell(f); olen = get_unaligned_le32(&olen); - /* - * Now we have the input (compressed) and output (uncompressed) - * sizes, compute the necessary decompression offset... - */ - - offs = (olen > ilen) ? olen - ilen : 0; - offs += olen >> 12; /* Add 8 bytes for each 32K block */ - offs += 64*1024 + 128; /* Add 64K + 128 bytes slack */ - offs = (offs+4095) & ~4095; /* Round to a 4K boundary */ run_size = atoi(argv[2]); printf(".section \".rodata..compressed\",\"a\",@progbits\n"); @@ -83,8 +72,6 @@ int main(int argc, char *argv[]) printf("z_input_len = %lu\n", ilen); printf(".globl z_output_len\n"); printf("z_output_len = %lu\n", (unsigned long)olen); - printf(".globl z_extract_offset\n"); - printf("z_extract_offset = 0x%lx\n", offs); printf(".globl z_run_size\n"); printf("z_run_size = %lu\n", run_size); diff --git a/arch/x86/boot/header.S b/arch/x86/boot/header.S index fd85b9e4e953..3dd5be33aaa7 100644 --- a/arch/x86/boot/header.S +++ b/arch/x86/boot/header.S @@ -508,13 +508,10 @@ pref_address: .quad LOAD_PHYSICAL_ADDR # preferred load addr # To avoid problems with the compressed data's meta information an extra 18 # bytes are needed. Leading to the formula: # -# extra_bytes = (uncompressed_size >> 12) + 32768 + 18 + decompressor_size +# extra_bytes = (uncompressed_size >> 12) + 32768 + 18 # # Adding 8 bytes per 32K is a bit excessive but much easier to calculate. # Adding 32768 instead of 32767 just makes for round numbers. -# Adding the decompressor_size is necessary as it musht live after all -# of the data as well. Last I measured the decompressor is about 14K. -# 10K of actual data and 4K of bss. # # Above analysis is for decompressing gzip compressed kernel only. Up to # now 6 different decompressor are supported all together. And among them @@ -524,17 +521,35 @@ pref_address: .quad LOAD_PHYSICAL_ADDR # preferred load addr # the description in lib/decompressor_xxx.c for specific information. # # extra_bytes = (uncompressed_size >> 12) + 65536 + 128 -# -# Note that this calculation, which results in z_extract_offset (below), -# is currently generated in compressed/mkpiggy.c -#define ZO_INIT_SIZE (ZO__end - ZO_startup_32 + ZO_z_extract_offset) +#define ZO_z_extra_bytes ((ZO_z_output_len >> 12) + 65536 + 128) +#if ZO_z_output_len > ZO_z_input_len +# define ZO_z_extract_offset (ZO_z_output_len + ZO_z_extra_bytes - \ + ZO_z_input_len) +#else +# define ZO_z_extract_offset ZO_z_extra_bytes +#endif + +/* + * The extract_offset has to be bigger than ZO head section. Otherwise when + * the head code is running to move ZO to the end of the buffer, it will + * overwrite the head code itself. + */ +#if (ZO__ehead - ZO_startup_32) > ZO_z_extract_offset +# define ZO_z_min_extract_offset ((ZO__ehead - ZO_startup_32 + 4095) & ~4095) +#else +# define ZO_z_min_extract_offset ((ZO_z_extract_offset + 4095) & ~4095) +#endif + +#define ZO_INIT_SIZE (ZO__end - ZO_startup_32 + ZO_z_min_extract_offset) + #define VO_INIT_SIZE (VO__end - VO__text) #if ZO_INIT_SIZE > VO_INIT_SIZE -#define INIT_SIZE ZO_INIT_SIZE +# define INIT_SIZE ZO_INIT_SIZE #else -#define INIT_SIZE VO_INIT_SIZE +# define INIT_SIZE VO_INIT_SIZE #endif + init_size: .long INIT_SIZE # kernel initialization size handover_offset: .long 0 # Filled in by build.c |