patch_romdrv_set_rom1_info.c

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/*
# _____     ___ ____     ___ ____
#  ____|   |    ____|   |        | |____|
# |     ___|   |____ ___|    ____| |    \    PS2DEV Open Source Project.
#-----------------------------------------------------------------------
# Copyright (c) 2003  Marcus R. Brown <mrbrown@0xd6.org>
# Licenced under Academic Free License version 2.0
# Review ps2sdk README & LICENSE files for further details.
*/
 
#include <tamtypes.h>
#include <kernel.h>
#include <sifdma.h>
#include <sifrpc.h>
 
#include "smod.h"
#include "slib.h"
 
#include "common.h"
 
/* from common.c */
extern struct smem_buf smem_buf;
 
int sbv_patch_romdrv_set_rom1_info(void *iop_reset_addr, int romdir_size)
{
    SifRpcReceiveData_t rdata;
    smod_mod_info_t romdrv_info;
    u32 *data;
    SifDmaTransfer_t dmat[1];
    int trid;
 
    /* Find the romdrv module.  */
    if (!smod_get_mod_by_name("ROM_file_driver", &romdrv_info))
        return -1;
 
    dmat[0].src = &smem_buf;
    dmat[0].size = 64;
    dmat[0].dest = (void *)(romdrv_info.text_start + romdrv_info.text_size + romdrv_info.data_size + 0x40);
    dmat[0].attr = 0;
 
    /* Get offset into rom mount information in bss section */
    SyncDCache(dmat[0].src, ((u8 *)dmat[0].src) + dmat[0].size);
    if (sceSifGetOtherData(&rdata, dmat[0].dest, dmat[0].src, dmat[0].size, 0) < 0)
        return 1;
    data = UNCACHED_SEG(dmat[0].src);
    /* Ensure data contains rom0: information */
    if (data[0] != 0xBFC00000 || data[1] <= data[0] || data[2] <= data[1])
        return 1;
 
    /* ImageStart for rom1: */
    data[3] = (u32)iop_reset_addr;
    /* RomdirStart for rom1: */
    data[4] = data[3];
    /* RomdirEnd for rom1: */
    data[5] = data[3] + romdir_size;
 
    sceSifWriteBackDCache(dmat[0].src, dmat[0].size);
    while (!(trid = sceSifSetDma(dmat, sizeof(dmat) / sizeof(dmat[0]))));
    while (sceSifDmaStat(trid) >= 0);
    return 0;
}