mirror of
https://github.com/Thesola10/umd-livepatch.git
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99 lines
2.2 KiB
C
99 lines
2.2 KiB
C
/**
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* @file main.c
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* @author Karim Vergnes <me@thesola.io>
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* @copyright GPLv2
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* @brief live patch application module for UMD games
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*
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* This module intercepts read commands from UMD, and selectively replaces them
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* with contents from a given rdiff file.
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* This allows patches such as translations to be applied to physical media
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* without requiring a dump.
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*/
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#include "io_funcs.h"
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#include <string.h>
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PSP_MODULE_INFO("umd_livepatch", PSP_MODULE_KERNEL, 2, 1);
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void lp_patchFunction(u32 addr, void *newaddr, void *fptr);
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PspIoDrvFuncs reserveUmdFuncs;
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PspIoDrvFuncs patchedUmdFuncs;
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PspIoDrv originalUmdDriver;
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PspIoDrv reserveUmdDriver = {
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.name = "umdraw",
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.dev_type = 4,
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.unk2 = 0x800,
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.name2 = "UMD_RAW",
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.funcs = &reserveUmdFuncs
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};
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PspIoDrv patchedUmdDriver = {
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.name = "umd",
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.dev_type = 4, // block device
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.unk2 = 0x800,
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.name2 = "UMD9660",
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.funcs = &patchedUmdFuncs
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};
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#define MAX_MODULE_NUMBER 256
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// Bogus read to test intercepting
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static int patched_IoRead(PspIoDrvFileArg *arg, char *data, int len)
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{
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Kprintf("Reading UMD data, hum dee dum...\n");
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return reserveUmdFuncs.IoRead(arg, data, len);
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}
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int module_start(SceSize argc, void *argp)
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{
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PspIoDrv *umdDriver = 0;
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int ret;
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Kprintf("------------------\nUMD Livepatch starting...\n");
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#ifdef CUSTOM_PATH
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//get_plugin_path(argp);
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#endif
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umdDriver = sctrlHENFindDriver("umd");
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if (umdDriver) {
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originalUmdDriver = *umdDriver;
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reserveUmdFuncs = *umdDriver->funcs;
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Kprintf("Found UMD driver at 0x%08x\n", umdDriver);
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} else {
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Kprintf("Could not find UMD driver...\n");
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return 1;
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}
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patchedUmdFuncs = reserveUmdFuncs;
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umdDriver->funcs->IoRead = patched_IoRead;
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umdDriver->funcs->IoDevctl = patched_IoDevctl;
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return 0;
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}
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int module_stop(void)
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{
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Kprintf("Unloading UMD Livepatch.");
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sceIoDelDrv("umd");
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sceIoAddDrv(&originalUmdDriver);
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sceIoDelDrv("umdraw");
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Kprintf("Restored original UMD driver\n");
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return 0;
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}
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void infernoSetDiscType(void) {}
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void infernoCacheSetPolicy(void) {}
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void infernoCacheInit(void) {}
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void infernoSetUmdDelay(void) {}
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// vim: ft=c.doxygen
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