diff options
Diffstat (limited to 'qemu/roms/SLOF/llfw/romfs.S')
| -rw-r--r-- | qemu/roms/SLOF/llfw/romfs.S | 362 |
1 files changed, 0 insertions, 362 deletions
diff --git a/qemu/roms/SLOF/llfw/romfs.S b/qemu/roms/SLOF/llfw/romfs.S deleted file mode 100644 index 325f79e5e..000000000 --- a/qemu/roms/SLOF/llfw/romfs.S +++ /dev/null @@ -1,362 +0,0 @@ -/****************************************************************************** - * Copyright (c) 2004, 2008 IBM Corporation - * All rights reserved. - * This program and the accompanying materials - * are made available under the terms of the BSD License - * which accompanies this distribution, and is available at - * http://www.opensource.org/licenses/bsd-license.php - * - * Contributors: - * IBM Corporation - initial implementation - *****************************************************************************/ -#include "macros.h" -#include "romfs.h" - -/******************************************************************* - * Wrapper for romfs_lookup. - * - * Input: - * R3 = address of filename string - * R4 = address of struct romfs_t - * 0: file size (return) - * 8: flags (return) - * 10: fileaddr (return and input: tells if first search) - * 18: nextfile (return) - * 20: namep (return) - * - * Find File Procedure - * - set filename and rombase, on return 0 file properties are stored - * in romfs_t else struct not valid - * - * Listing procedure - * - clear romfs_t (important!) - * - set filename = NULL and rombase and call returns first file - * with properties in romfs_t including next-file pointer - * - if nextpointer is non-zero then just the next file is returned - * - * Returns: - * <Success>: - * R3 = 0 - * romfs_t is updated - * <FileNotFound>: - * R3 = 1 - * romfs_t not touched - * - * Potentially modifies the following registers: - * - - Example usage from C: - - int list_bootrom() - { - struct romfs_t rfs; - int i; - - printf("Build: "__TIME__" "__DATE__" \n"); - - i = 0; - memset((void*) &rfs, 0, sizeof(struct romfs_t)); - printf(" No. File Data Size Name\n"); - - while (romfs_stat(NULL, &rfs) == 0) { - i++; - printf(" %02d: %08X %08X %7d %s\n", - i, rfs.fileaddr, rfs.datap, - rfs.size, rfs.namep); - } - if (0 == i) { - printf("Error in reading ROMFS\n"); - return 1; - } - return 0; - } - *******************************************************************/ -#define RFS_T_SIZE 0x00 -#define RFS_T_FLAGS 0x08 -#define RFS_T_FILEADDR 0x10 -#define RFS_T_NEXT 0x18 -#define RFS_T_NAME 0x20 -#define RFS_T_DATA 0x28 - -#define RFS_H_NEXT 0x00 -#define RFS_H_SIZE 0x08 -#define RFS_H_FLAGS 0x10 -#define RFS_H_DATA 0x18 -#define RFS_H_NAME 0x20 - -ENTRY(romfs_stat_file) - /* save link register and romfs_t pointer */ - mflr r15 - mr r16, r4 - - /* if filename R3 is 0 then its a listing request */ - /* if not then just continue to lookup name */ - /* save R4 to R8 which is the address of header */ - li r7, 0 - cmpd r3, r7 - beq romfs_list - bl romfs_lookup - mfsprg r8, 1 - - /* if file found then go to romfs_fill_properties */ - /* else return 1 to caller */ - cmpwi r3, 0 - beq romfs_fill_properties - b romfs_stat_end - - romfs_list: - /* check if fileaddr == 0, in this case its */ - /* the first search on this handle, so return all */ - /* info for file at rombase (R8=R4) */ - ld r6, RFS_T_FILEADDR(r4) - mfsprg r8, 1 - li r7, 0 - cmpd r7, r6 - beq romfs_fill_properties - - /* check if next file != 0 by looking into */ - /* romfs_t, if not then return (next = 0) 1 */ - li r7, 0 - ld r4, RFS_T_NEXT(r4) - cmpd r7, r4 - li r3, 1 - beq romfs_stat_end - - /* now next file is available so move R8 to next */ - /* file address */ - mr r8, r4 - - romfs_fill_properties: - /* set properties in romfs_t takes R8 as address */ - /* to file header and R16 as address of romfs_t */ - mfsprg r3, 1 - std r8, RFS_T_FILEADDR(r16) - - ld r4, RFS_H_NEXT(r8) - li r7, 0 - cmpd r7, r4 - beq $ + (2 * 4) /* =0 so add no rombase */ - add r4, r4, r3 - std r4, RFS_T_NEXT(r16) - - ld r4, RFS_H_SIZE(r8) - std r4, RFS_T_SIZE(r16) - ld r4, RFS_H_FLAGS(r8) - std r4, RFS_T_FLAGS(r16) - - ld r4, RFS_H_DATA(r8) - add r4, r4, r3 - std r4, RFS_T_DATA(r16) - - addi r4, r8, RFS_H_NAME - std r4, RFS_T_NAME(r16) - - li r3, 0 - - /* restore romfs_t pointer and link register */ - romfs_stat_end: - mr r5, r16 - mtlr r15 - blr - -/******************************************************************* - * Copies the data of file referenced by name string to address - * requires root address of filesystem. - * FIXME: ignores flags - * - * Input: - * R3 = address of filename string - * R4 = ROMBASE - * R5 = destination address - * - * Returns: - * <Success>: R3 = 0, R6 = size, <FileNotFound>: R3 = 1 - * R5 is kept - * - * Potentially modifies the following registers: - * ctr, r15, r16, r17, r18 - * - * Uses the following calls with subsequent register modification: - * - romfs_lookup - *******************************************************************/ -ASM_ENTRY(romfs_load) - mflr r15 - - /* save R5 twice */ - /* lookup file, input regs */ - /* are already set */ - /* if not found, just return */ - mr r16, r5 - mr r17, r5 - bl romfs_lookup - cmpwi r3, 1 - bne 0f - mtlr r15 - blr /* abort, not found */ - - /* save data size for return */ - /* found, copy data */ - /* data size is in R6 */ -0: - //mr r3, r6 - mtctr r6 - addi r16, r16, -1 /* dest */ - addi r5, r5, -1 /* source*/ - - /* data is expected to be */ - /* 8 byte aligned */ - /* copy loop */ -0: lbzu r18, 1(r5) - stbu r18, 1(r16) - bdnz 0b - - /* restore size, keep padding */ - /* restore target address */ - /* return */ - mr r5, r17 - mtlr r15 - blr - -/******************************************************************* - * looks up a file based on filename - * - * Input: - * R3 = address of filename string - * R4 = ROMBASE - * - * Returns: - * <Success>: - * R3 = 0 - * R4 = address of file header - * R5 = address of data (real address) - * R6 = size of data - * R7 = flags for file - * <FileNotFound>: - * R3 = 1 - * - * Potentially modifies the following registers: - * R3, R4, R5, R6, R7, R8, R9 - * - * Uses the following calls with subsequent register modification: - * - romfs_namematch - *******************************************************************/ -ASM_ENTRY(romfs_lookup) - mflr r9 - - romfs_lookup_next: - /* save current file base */ - mr r8, r4 - /* name to look for */ - mr r10, r3 - /* name of file */ - mr r5, r4 - addi r5, r5, (4 /* elems */ * 8 /* elem-size */) - mr r11, r5 /* for namematch */ - /* compare */ - bl romfs_namematch - cmpwi r12, 1 - bne romfs_lookup_match - - /* load next pointer */ - /* check if next is 0 */ - /* apply root-offset */ - ld r5, 0(r4) - cmpwi r5, 0 - add r4, r4, r5 - bne romfs_lookup_next - /* last file reached, abort */ - li r3, 1 - mtlr r9 - blr - - /* here the name did match */ - /* r4 is still usable here and */ - /* pointing to the initial file */ - /* load r5 with data ptr */ - /* load r6 with data size */ - /* load r7 with flags */ - /* get abs addr of data */ - romfs_lookup_match: - li r3, 0 - ld r5, (3 * 8)(r4) /* data */ - ld r6, (1 * 8)(r4) /* len */ - ld r7, (2 * 8)(r4) /* flags */ - add r5, r5, r8 - mtlr r9 - blr - -/******************************************************************* - * compares two strings in memory, - * both must be null-terminated and 8-byte aligned - * - * Input: - * R10 = string 1 - * R11 = string 2 - * - * Returns: - * <Match>: R12 = 0 <NoMatch>: R12 = 1 - * - * Potentially modifies the following registers: - * R10, R11, r12, r13, r14 - *******************************************************************/ -romfs_namematch: - subi r10, r10, 8 - subi r11, r11, 8 - - /* - * load chars as 8byte chunk from current pos, name is - * always 8 byte aligned :) - */ - romfs_cmp_loop: - ldu r13, 8(r10) /* A */ - ldu r14, 8(r11) /* B */ - - cmpd r13, r14 - li r12, 1 - beq 1f - blr - -1: andi. r14, r14, 0xff - bne romfs_cmp_loop - - li r12, 0 - blr - -/******************************************************************* - * wrapper for romfs_lookup - * this function saves the registers from r13 - r15 on the stack - * calls romfs_lookup - * restores the saved registers - * - * the return parameters are copied to (r5) and (r5) has to - * be 0x20 big - *******************************************************************/ -ENTRY(c_romfs_lookup) - stdu r1,-0x50(r1) # allocate space on stack - - mflr r0 # save link register - std r0,0x30(r1) - - std r15,0x38(r1) # save r15 - std r14,0x40(r1) # save r14 - std r13,0x48(r1) # and r13 - - mr r15,r5 # save the pointer for the return value - - bl romfs_lookup # do the thing - - ld r0,0x30(r1) # restore link register - mtlr r0 - - std r4,0x00(r15) # copy return values - std r5,0x08(r15) # to the return pointer - std r6,0x10(r15) - std r7,0x18(r15) - - ld r13,0x48(r1) # restore registers from stack - ld r14,0x40(r1) - ld r15,0x38(r1) - - addi r1,r1,0x50 # cleanup stack - - blr |