diff options
Diffstat (limited to 'arch/ppc/boot/utils/addRamDisk.c')
| -rw-r--r-- | arch/ppc/boot/utils/addRamDisk.c | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/arch/ppc/boot/utils/addRamDisk.c b/arch/ppc/boot/utils/addRamDisk.c new file mode 100644 index 000000000000..93400dfcce7f --- /dev/null +++ b/arch/ppc/boot/utils/addRamDisk.c @@ -0,0 +1,203 @@ +#include <stdio.h> +#include <stdlib.h> +#include <netinet/in.h> +#include <unistd.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <string.h> + +#define ElfHeaderSize (64 * 1024) +#define ElfPages (ElfHeaderSize / 4096) +#define KERNELBASE (0xc0000000) + +void get4k(FILE *file, char *buf ) +{ + unsigned j; + unsigned num = fread(buf, 1, 4096, file); + for ( j=num; j<4096; ++j ) + buf[j] = 0; +} + +void put4k(FILE *file, char *buf ) +{ + fwrite(buf, 1, 4096, file); +} + +void death(const char *msg, FILE *fdesc, const char *fname) +{ + printf(msg); + fclose(fdesc); + unlink(fname); + exit(1); +} + +int main(int argc, char **argv) +{ + char inbuf[4096]; + FILE *ramDisk = NULL; + FILE *inputVmlinux = NULL; + FILE *outputVmlinux = NULL; + unsigned i = 0; + u_int32_t ramFileLen = 0; + u_int32_t ramLen = 0; + u_int32_t roundR = 0; + u_int32_t kernelLen = 0; + u_int32_t actualKernelLen = 0; + u_int32_t round = 0; + u_int32_t roundedKernelLen = 0; + u_int32_t ramStartOffs = 0; + u_int32_t ramPages = 0; + u_int32_t roundedKernelPages = 0; + u_int32_t hvReleaseData = 0; + u_int32_t eyeCatcher = 0xc8a5d9c4; + u_int32_t naca = 0; + u_int32_t xRamDisk = 0; + u_int32_t xRamDiskSize = 0; + if ( argc < 2 ) { + printf("Name of RAM disk file missing.\n"); + exit(1); + } + + if ( argc < 3 ) { + printf("Name of vmlinux file missing.\n"); + exit(1); + } + + if ( argc < 4 ) { + printf("Name of vmlinux output file missing.\n"); + exit(1); + } + + ramDisk = fopen(argv[1], "r"); + if ( ! ramDisk ) { + printf("RAM disk file \"%s\" failed to open.\n", argv[1]); + exit(1); + } + inputVmlinux = fopen(argv[2], "r"); + if ( ! inputVmlinux ) { + printf("vmlinux file \"%s\" failed to open.\n", argv[2]); + exit(1); + } + outputVmlinux = fopen(argv[3], "w+"); + if ( ! outputVmlinux ) { + printf("output vmlinux file \"%s\" failed to open.\n", argv[3]); + exit(1); + } + fseek(ramDisk, 0, SEEK_END); + ramFileLen = ftell(ramDisk); + fseek(ramDisk, 0, SEEK_SET); + printf("%s file size = %d\n", argv[1], ramFileLen); + + ramLen = ramFileLen; + + roundR = 4096 - (ramLen % 4096); + if ( roundR ) { + printf("Rounding RAM disk file up to a multiple of 4096, adding %d\n", roundR); + ramLen += roundR; + } + + printf("Rounded RAM disk size is %d\n", ramLen); + fseek(inputVmlinux, 0, SEEK_END); + kernelLen = ftell(inputVmlinux); + fseek(inputVmlinux, 0, SEEK_SET); + printf("kernel file size = %d\n", kernelLen); + if ( kernelLen == 0 ) { + printf("You must have a linux kernel specified as argv[2]\n"); + exit(1); + } + + actualKernelLen = kernelLen - ElfHeaderSize; + + printf("actual kernel length (minus ELF header) = %d\n", actualKernelLen); + + round = actualKernelLen % 4096; + roundedKernelLen = actualKernelLen; + if ( round ) + roundedKernelLen += (4096 - round); + + printf("actual kernel length rounded up to a 4k multiple = %d\n", roundedKernelLen); + + ramStartOffs = roundedKernelLen; + ramPages = ramLen / 4096; + + printf("RAM disk pages to copy = %d\n", ramPages); + + // Copy 64K ELF header + for (i=0; i<(ElfPages); ++i) { + get4k( inputVmlinux, inbuf ); + put4k( outputVmlinux, inbuf ); + } + + roundedKernelPages = roundedKernelLen / 4096; + + fseek(inputVmlinux, ElfHeaderSize, SEEK_SET); + + for ( i=0; i<roundedKernelPages; ++i ) { + get4k( inputVmlinux, inbuf ); + put4k( outputVmlinux, inbuf ); + } + + for ( i=0; i<ramPages; ++i ) { + get4k( ramDisk, inbuf ); + put4k( outputVmlinux, inbuf ); + } + + /* Close the input files */ + fclose(ramDisk); + fclose(inputVmlinux); + /* And flush the written output file */ + fflush(outputVmlinux); + + /* fseek to the hvReleaseData pointer */ + fseek(outputVmlinux, ElfHeaderSize + 0x24, SEEK_SET); + if (fread(&hvReleaseData, 4, 1, outputVmlinux) != 1) { + death("Could not read hvReleaseData pointer\n", outputVmlinux, argv[3]); + } + hvReleaseData = ntohl(hvReleaseData); /* Convert to native int */ + printf("hvReleaseData is at %08x\n", hvReleaseData); + + /* fseek to the hvReleaseData */ + fseek(outputVmlinux, ElfHeaderSize + hvReleaseData, SEEK_SET); + if (fread(inbuf, 0x40, 1, outputVmlinux) != 1) { + death("Could not read hvReleaseData\n", outputVmlinux, argv[3]); + } + /* Check hvReleaseData sanity */ + if (memcmp(inbuf, &eyeCatcher, 4) != 0) { + death("hvReleaseData is invalid\n", outputVmlinux, argv[3]); + } + /* Get the naca pointer */ + naca = ntohl(*((u_int32_t *) &inbuf[0x0c])) - KERNELBASE; + printf("naca is at %08x\n", naca); + + /* fseek to the naca */ + fseek(outputVmlinux, ElfHeaderSize + naca, SEEK_SET); + if (fread(inbuf, 0x18, 1, outputVmlinux) != 1) { + death("Could not read naca\n", outputVmlinux, argv[3]); + } + xRamDisk = ntohl(*((u_int32_t *) &inbuf[0x0c])); + xRamDiskSize = ntohl(*((u_int32_t *) &inbuf[0x14])); + /* Make sure a RAM disk isn't already present */ + if ((xRamDisk != 0) || (xRamDiskSize != 0)) { + death("RAM disk is already attached to this kernel\n", outputVmlinux, argv[3]); + } + /* Fill in the values */ + *((u_int32_t *) &inbuf[0x0c]) = htonl(ramStartOffs); + *((u_int32_t *) &inbuf[0x14]) = htonl(ramPages); + + /* Write out the new naca */ + fflush(outputVmlinux); + fseek(outputVmlinux, ElfHeaderSize + naca, SEEK_SET); + if (fwrite(inbuf, 0x18, 1, outputVmlinux) != 1) { + death("Could not write naca\n", outputVmlinux, argv[3]); + } + printf("RAM Disk of 0x%x pages size is attached to the kernel at offset 0x%08x\n", + ramPages, ramStartOffs); + + /* Done */ + fclose(outputVmlinux); + /* Set permission to executable */ + chmod(argv[3], S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH); + + return 0; +} + |