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yaml --- r: 6467 b: refs/heads/master c: 7ef24b6 h: refs/heads/master i: 6465: 7d53d2e 6463: 832377c v: v3
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Andrew Morton
authored and
Jeff Garzik
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Aug 30, 2005
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,2 +1,2 @@ | ||
| --- | ||
| refs/heads/master: a8e4f435d9ea38bfe9171d7458b2057d440825b1 | ||
| refs/heads/master: 7ef24b69f9ff4858d7242059fbb19477c10e6dd7 |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -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); | ||
|
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||
| round = actualKernelLen % 4096; | ||
| roundedKernelLen = actualKernelLen; | ||
| if ( round ) | ||
| roundedKernelLen += (4096 - round); | ||
|
|
||
| printf("actual kernel length rounded up to a 4k multiple = %d\n", roundedKernelLen); | ||
|
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||
| 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; | ||
| } | ||
|
|
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