From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds@ppc970.osdl.org>
Date: Sat, 16 Apr 2005 15:20:36 -0700
Subject: Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
---
 arch/ppc/boot/utils/addRamDisk.c | 203 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 203 insertions(+)
 create mode 100644 arch/ppc/boot/utils/addRamDisk.c

(limited to 'arch/ppc/boot/utils/addRamDisk.c')

diff --git a/arch/ppc/boot/utils/addRamDisk.c b/arch/ppc/boot/utils/addRamDisk.c
new file mode 100644
index 00000000000..93400dfcce7
--- /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;
+}
+
-- 
cgit v1.2.3