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Add implementation for PSX SysMalloc.

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This commit is contained in:
Jean-Philip Desjardins 2018-02-05 12:47:49 -05:00
parent bc2cc57a0b
commit a758886eea
2 changed files with 20 additions and 3 deletions
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22
tools/PsfPlayer/Source/psx/PsxBios.cpp
View File

@ -16,6 +16,7 @@
using namespace Iop;
#define EXITFROMEXCEPTION_STATE_ADDR (0x0200)
#define SYSHEAP_POINTER_ADDR (0x0204)
#define INTR_HANDLER (0x1000)
#define EVENT_CHECKER (0x1200)
#define KERNEL_STACK (0x2000)
@ -27,14 +28,19 @@ using namespace Iop;
#define C0TABLE_SIZE (0x1C * 4)
#define C0_EXCEPTIONHANDLER_BEGIN (C0TABLE_BEGIN + C0TABLE_SIZE)
#define C0_EXCEPTIONHANDLER_SIZE (0x1000)
#define HEAP_START (C0_EXCEPTIONHANDLER_BEGIN + C0_EXCEPTIONHANDLER_SIZE)
#define HEAP_SIZE (0x2000)
#define BIOS_MEMORY_END (HEAP_START + HEAP_SIZE)
CPsxBios::CPsxBios(CMIPS& cpu, uint8* ram, uint32 ramSize)
: m_cpu(cpu)
, m_ram(ram)
, m_ramSize(ramSize)
, m_exitFromExceptionStateAddr(reinterpret_cast<uint32*>(m_ram + EXITFROMEXCEPTION_STATE_ADDR))
, m_sysHeapPointerAddr(reinterpret_cast<uint32*>(m_ram + SYSHEAP_POINTER_ADDR))
, m_events(reinterpret_cast<EVENT*>(&m_ram[EVENTS_BEGIN]), 1, MAX_EVENT)
{
static_assert(BIOS_MEMORY_END <= 0x10000, "BIOS memory size must not exceed 64k");
Reset();
}
@ -86,6 +92,7 @@ void CPsxBios::Reset()
}
m_exitFromExceptionStateAddr = 0;
m_sysHeapPointerAddr = HEAP_START;
memset(m_events.GetBase(), 0, EVENTS_SIZE);
}
@ -595,7 +602,9 @@ void CPsxBios::DisassembleSyscall(uint32 searchAddress)
m_cpu.m_State.nGPR[SC_PARAM1].nV0);
break;
case 0x08:
CLog::GetInstance().Print(LOG_NAME, "SysInitMemory();\r\n");
CLog::GetInstance().Print(LOG_NAME, "SysInitMemory(address = 0x%08X, size = 0x%X);\r\n",
m_cpu.m_State.nGPR[SC_PARAM0].nV0,
m_cpu.m_State.nGPR[SC_PARAM1].nV0);
break;
case 0x0A:
CLog::GetInstance().Print(LOG_NAME, "ChangeClearRCnt(param0 = %i, param1 = %i);\r\n",
@ -760,7 +769,11 @@ void CPsxBios::sc_SysMalloc()
{
uint32 length = m_cpu.m_State.nGPR[SC_PARAM0].nV0;
m_cpu.m_State.nGPR[SC_RETURN].nV0 = 0;
assert((m_sysHeapPointerAddr + length) <= (HEAP_START + HEAP_SIZE));
uint32 result = m_sysHeapPointerAddr;
m_sysHeapPointerAddr += length;
m_cpu.m_State.nGPR[SC_RETURN].nV0 = result;
}
//B0 - 07
@ -942,7 +955,10 @@ void CPsxBios::sc_SysDeqIntRP()
//C0 - 08
void CPsxBios::sc_SysInitMemory()
{
//Two parameters are passed, but don't seem to be used somehow?
//TODO: Reset PCB and TCB addresses
m_sysHeapPointerAddr = HEAP_START;
memset(m_ram + HEAP_START, 0, HEAP_SIZE);
}
//C0 - 0A

1
tools/PsfPlayer/Source/psx/PsxBios.h
View File

@ -148,6 +148,7 @@ private:
uint32 m_ramSize;
OsVariableWrapper<uint32> m_exitFromExceptionStateAddr;
OsVariableWrapper<uint32> m_sysHeapPointerAddr;
COsStructManager<EVENT> m_events;