powerpc: Move ppc64 boot wrapper code over to arch/powerpc

This also extends the code to handle 32-bit ELF vmlinux files as well
as 64-bit ones.  This is sufficient for booting on new-world 32-bit
powermacs (i.e. all recent machines).

Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 311 insertions, 0 deletions

diff --git a/arch/powerpc/boot/addRamDisk.c b/arch/powerpc/boot/addRamDisk.c
new file mode 100644
index 00000000000..c02a99952be
--- /dev/null
+++ b/arch/powerpc/boot/addRamDisk.c
@@ -0,0 +1,311 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <netinet/in.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <string.h>
+#include <elf.h>
+
+#define ElfHeaderSize  (64 * 1024)
+#define ElfPages  (ElfHeaderSize / 4096)
+#define KERNELBASE (0xc000000000000000)
+#define _ALIGN_UP(addr,size)	(((addr)+((size)-1))&(~((size)-1)))
+
+struct addr_range {
+	unsigned long long addr;
+	unsigned long memsize;
+	unsigned long offset;
+};
+
+static int check_elf64(void *p, int size, struct addr_range *r)
+{
+	Elf64_Ehdr *elf64 = p;
+	Elf64_Phdr *elf64ph;
+
+	if (elf64->e_ident[EI_MAG0] != ELFMAG0 ||
+	    elf64->e_ident[EI_MAG1] != ELFMAG1 ||
+	    elf64->e_ident[EI_MAG2] != ELFMAG2 ||
+	    elf64->e_ident[EI_MAG3] != ELFMAG3 ||
+	    elf64->e_ident[EI_CLASS] != ELFCLASS64 ||
+	    elf64->e_ident[EI_DATA] != ELFDATA2MSB ||
+	    elf64->e_type != ET_EXEC || elf64->e_machine != EM_PPC64)
+		return 0;
+
+	if ((elf64->e_phoff + sizeof(Elf64_Phdr)) > size)
+		return 0;
+
+	elf64ph = (Elf64_Phdr *) ((unsigned long)elf64 +
+				  (unsigned long)elf64->e_phoff);
+
+	r->memsize = (unsigned long)elf64ph->p_memsz;
+	r->offset = (unsigned long)elf64ph->p_offset;
+	r->addr = (unsigned long long)elf64ph->p_vaddr;
+
+#ifdef DEBUG
+	printf("PPC64 ELF file, ph:\n");
+	printf("p_type   0x%08x\n", elf64ph->p_type);
+	printf("p_flags  0x%08x\n", elf64ph->p_flags);
+	printf("p_offset 0x%016llx\n", elf64ph->p_offset);
+	printf("p_vaddr  0x%016llx\n", elf64ph->p_vaddr);
+	printf("p_paddr  0x%016llx\n", elf64ph->p_paddr);
+	printf("p_filesz 0x%016llx\n", elf64ph->p_filesz);
+	printf("p_memsz  0x%016llx\n", elf64ph->p_memsz);
+	printf("p_align  0x%016llx\n", elf64ph->p_align);
+	printf("... skipping 0x%08lx bytes of ELF header\n",
+	       (unsigned long)elf64ph->p_offset);
+#endif
+
+	return 64;
+}
+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) 
+{
+	fprintf(stderr, msg);
+	fclose(fdesc);
+	unlink(fname);
+	exit(1);
+}
+
+int main(int argc, char **argv)
+{
+	char inbuf[4096];
+	struct addr_range vmlinux;
+	FILE *ramDisk;
+	FILE *inputVmlinux;
+	FILE *outputVmlinux;
+
+	char *rd_name, *lx_name, *out_name;
+
+	size_t i;
+	unsigned long ramFileLen;
+	unsigned long ramLen;
+	unsigned long roundR;
+	unsigned long offset_end;
+
+	unsigned long kernelLen;
+	unsigned long actualKernelLen;
+	unsigned long round;
+	unsigned long roundedKernelLen;
+	unsigned long ramStartOffs;
+	unsigned long ramPages;
+	unsigned long roundedKernelPages;
+	unsigned long hvReleaseData;
+	u_int32_t eyeCatcher = 0xc8a5d9c4;
+	unsigned long naca;
+	unsigned long xRamDisk;
+	unsigned long xRamDiskSize;
+	long padPages;
+  
+  
+	if (argc < 2) {
+		fprintf(stderr, "Name of RAM disk file missing.\n");
+		exit(1);
+	}
+	rd_name = argv[1];
+
+	if (argc < 3) {
+		fprintf(stderr, "Name of vmlinux file missing.\n");
+		exit(1);
+	}
+	lx_name = argv[2];
+
+	if (argc < 4) {
+		fprintf(stderr, "Name of vmlinux output file missing.\n");
+		exit(1);
+	}
+	out_name = argv[3];
+
+
+	ramDisk = fopen(rd_name, "r");
+	if ( ! ramDisk ) {
+		fprintf(stderr, "RAM disk file \"%s\" failed to open.\n", rd_name);
+		exit(1);
+	}
+
+	inputVmlinux = fopen(lx_name, "r");
+	if ( ! inputVmlinux ) {
+		fprintf(stderr, "vmlinux file \"%s\" failed to open.\n", lx_name);
+		exit(1);
+	}
+  
+	outputVmlinux = fopen(out_name, "w+");
+	if ( ! outputVmlinux ) {
+		fprintf(stderr, "output vmlinux file \"%s\" failed to open.\n", out_name);
+		exit(1);
+	}
+
+	i = fread(inbuf, 1, sizeof(inbuf), inputVmlinux);
+	if (i != sizeof(inbuf)) {
+		fprintf(stderr, "can not read vmlinux file %s: %u\n", lx_name, i);
+		exit(1);
+	}
+
+	i = check_elf64(inbuf, sizeof(inbuf), &vmlinux);
+	if (i == 0) {
+		fprintf(stderr, "You must have a linux kernel specified as argv[2]\n");
+		exit(1);
+	}
+
+	/* Input Vmlinux file */
+	fseek(inputVmlinux, 0, SEEK_END);
+	kernelLen = ftell(inputVmlinux);
+	fseek(inputVmlinux, 0, SEEK_SET);
+	printf("kernel file size = %lu\n", kernelLen);
+
+	actualKernelLen = kernelLen - ElfHeaderSize;
+
+	printf("actual kernel length (minus ELF header) = %lu\n", actualKernelLen);
+
+	round = actualKernelLen % 4096;
+	roundedKernelLen = actualKernelLen;
+	if ( round )
+		roundedKernelLen += (4096 - round);
+	printf("Vmlinux length rounded up to a 4k multiple = %ld/0x%lx \n", roundedKernelLen, roundedKernelLen);
+	roundedKernelPages = roundedKernelLen / 4096;
+	printf("Vmlinux pages to copy = %ld/0x%lx \n", roundedKernelPages, roundedKernelPages);
+
+	offset_end = _ALIGN_UP(vmlinux.memsize, 4096);
+	/* calc how many pages we need to insert between the vmlinux and the start of the ram disk */
+	padPages = offset_end/4096 - roundedKernelPages;
+
+	/* Check and see if the vmlinux is already larger than _end in System.map */
+	if (padPages < 0) {
+		/* vmlinux is larger than _end - adjust the offset to the start of the embedded ram disk */ 
+		offset_end = roundedKernelLen;
+		printf("vmlinux is larger than _end indicates it needs to be - offset_end = %lx \n", offset_end);
+		padPages = 0;
+		printf("will insert %lx pages between the vmlinux and the start of the ram disk \n", padPages);
+	}
+	else {
+		/* _end is larger than vmlinux - use the offset to _end that we calculated from the system map */
+		printf("vmlinux is smaller than _end indicates is needed - offset_end = %lx \n", offset_end);
+		printf("will insert %lx pages between the vmlinux and the start of the ram disk \n", padPages);
+	}
+
+
+
+	/* Input Ram Disk file */
+	// Set the offset that the ram disk will be started at.
+	ramStartOffs = offset_end;  /* determined from the input vmlinux file and the system map */
+	printf("Ram Disk will start at offset = 0x%lx \n", ramStartOffs);
+  
+	fseek(ramDisk, 0, SEEK_END);
+	ramFileLen = ftell(ramDisk);
+	fseek(ramDisk, 0, SEEK_SET);
+	printf("%s file size = %ld/0x%lx \n", rd_name, ramFileLen, ramFileLen);
+
+	ramLen = ramFileLen;
+
+	roundR = 4096 - (ramLen % 4096);
+	if ( roundR ) {
+		printf("Rounding RAM disk file up to a multiple of 4096, adding %ld/0x%lx \n", roundR, roundR);
+		ramLen += roundR;
+	}
+
+	printf("Rounded RAM disk size is %ld/0x%lx \n", ramLen, ramLen);
+	ramPages = ramLen / 4096;
+	printf("RAM disk pages to copy = %ld/0x%lx\n", ramPages, ramPages);
+
+
+
+  // Copy 64K ELF header
+	for (i=0; i<(ElfPages); ++i) {
+		get4k( inputVmlinux, inbuf );
+		put4k( outputVmlinux, inbuf );
+	}
+
+	/* Copy the vmlinux (as full pages). */
+	fseek(inputVmlinux, ElfHeaderSize, SEEK_SET);
+	for ( i=0; i<roundedKernelPages; ++i ) {
+		get4k( inputVmlinux, inbuf );
+		put4k( outputVmlinux, inbuf );
+	}
+  
+	/* Insert pad pages (if appropriate) that are needed between */
+	/* | the end of the vmlinux and the ram disk. */
+	for (i=0; i<padPages; ++i) {
+		memset(inbuf, 0, 4096);
+		put4k(outputVmlinux, inbuf);
+	}
+
+	/* Copy the ram disk (as full pages). */
+	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);
+
+
+
+	/* Fixup the new vmlinux to contain the ram disk starting offset (xRamDisk) and the ram disk size (xRamDiskSize) */
+	/* 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, out_name);
+	}
+	hvReleaseData = ntohl(hvReleaseData); /* Convert to native int */
+	printf("hvReleaseData is at %08lx\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, out_name);
+	}
+	/* Check hvReleaseData sanity */
+	if (memcmp(inbuf, &eyeCatcher, 4) != 0) {
+		death("hvReleaseData is invalid\n", outputVmlinux, out_name);
+	}
+	/* Get the naca pointer */
+	naca = ntohl(*((u_int32_t*) &inbuf[0x0C])) - KERNELBASE;
+	printf("Naca is at offset 0x%lx \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, out_name);
+	}
+	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, out_name);
+	}
+	/* 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, out_name);
+	}
+	printf("Ram Disk of 0x%lx pages is attached to the kernel at offset 0x%08lx\n",
+	       ramPages, ramStartOffs);
+
+	/* Done */
+	fclose(outputVmlinux);
+	/* Set permission to executable */
+	chmod(out_name, S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH);
+
+	return 0;
+}
+