sys.c

gumstiz u-boot loader in linux

Long value read from emulator memory.
REMARKS:
Reads a long value from the emulator memory.
****************************************************************************/
u32 X86API rdl(
	u32 addr)
{
	u32 val = 0;

	if (addr > M.mem_size - 4) {
		DB(printk("mem_read: address %#lx out of range!\n", addr);)
		HALT_SYS();
		}
#ifdef __BIG_ENDIAN__
	if (addr & 0x3) {
		val = (*(u8*)(M.mem_base + addr + 0) |
			  (*(u8*)(M.mem_base + addr + 1) << 8) |
			  (*(u8*)(M.mem_base + addr + 2) << 16) |
			  (*(u8*)(M.mem_base + addr + 3) << 24));
		}
	else
#endif
#ifdef __alpha__
		val = ldl_u((u32*)(M.mem_base + addr));
#elif defined (__ia64__)
		val = uldl((u32*)(M.mem_base + addr));
#else
		val = *(u32*)(M.mem_base + addr);
#endif
DB(	if (DEBUG_MEM_TRACE())
		printk("%#08x 4 -> %#x\n", addr, val);)
	return val;
}

/****************************************************************************
PARAMETERS:
addr	- Emulator memory address to read
val		- Value to store

REMARKS:
Writes a byte value to emulator memory.
****************************************************************************/
void X86API wrb(
	u32 addr,
	u8 val)
{
DB(	if (DEBUG_MEM_TRACE())
		printk("%#08x 1 <- %#x\n", addr, val);)
    if (addr > M.mem_size - 1) {
		DB(printk("mem_write: address %#lx out of range!\n", addr);)
		HALT_SYS();
		}
	*(u8*)(M.mem_base + addr) = val;
}

/****************************************************************************
PARAMETERS:
addr	- Emulator memory address to read
val		- Value to store

REMARKS:
Writes a word value to emulator memory.
****************************************************************************/
void X86API wrw(
	u32 addr,
	u16 val)
{
DB(	if (DEBUG_MEM_TRACE())
		printk("%#08x 2 <- %#x\n", addr, val);)
	if (addr > M.mem_size - 2) {
		DB(printk("mem_write: address %#lx out of range!\n", addr);)
		HALT_SYS();
		}
#ifdef __BIG_ENDIAN__
	if (addr & 0x1) {
		*(u8*)(M.mem_base + addr + 0) = (val >> 0) & 0xff;
		*(u8*)(M.mem_base + addr + 1) = (val >> 8) & 0xff;
		}
	else
#endif
#ifdef __alpha__
	 stw_u(val,(u16*)(M.mem_base + addr));
#elif defined (__ia64__)
	 ustw(val,(u16*)(M.mem_base + addr));
#else
	 *(u16*)(M.mem_base + addr) = val;
#endif
}

/****************************************************************************
PARAMETERS:
addr	- Emulator memory address to read
val		- Value to store

REMARKS:
Writes a long value to emulator memory.
****************************************************************************/
void X86API wrl(
	u32 addr,
	u32 val)
{
DB(	if (DEBUG_MEM_TRACE())
		printk("%#08x 4 <- %#x\n", addr, val);)
	if (addr > M.mem_size - 4) {
		DB(printk("mem_write: address %#lx out of range!\n", addr);)
		HALT_SYS();
		}
#ifdef __BIG_ENDIAN__
	if (addr & 0x1) {
		*(u8*)(M.mem_base + addr + 0) = (val >>  0) & 0xff;
		*(u8*)(M.mem_base + addr + 1) = (val >>  8) & 0xff;
		*(u8*)(M.mem_base + addr + 2) = (val >> 16) & 0xff;
		*(u8*)(M.mem_base + addr + 3) = (val >> 24) & 0xff;
		}
	else
#endif
#ifdef __alpha__
	 stl_u(val,(u32*)(M.mem_base + addr));
#elif defined (__ia64__)
	 ustl(val,(u32*)(M.mem_base + addr));
#else
	 *(u32*)(M.mem_base + addr) = val;
#endif
}

/****************************************************************************
PARAMETERS:
addr	- PIO address to read
RETURN:
0
REMARKS:
Default PIO byte read function. Doesn't perform real inb.
****************************************************************************/
static u8 X86API p_inb(
	X86EMU_pioAddr addr)
{
DB(	if (DEBUG_IO_TRACE())
		printk("inb %#04x \n", addr);)
	return 0;
}

/****************************************************************************
PARAMETERS:
addr	- PIO address to read
RETURN:
0
REMARKS:
Default PIO word read function. Doesn't perform real inw.
****************************************************************************/
static u16 X86API p_inw(
	X86EMU_pioAddr addr)
{
DB(	if (DEBUG_IO_TRACE())
		printk("inw %#04x \n", addr);)
	return 0;
}

/****************************************************************************
PARAMETERS:
addr	- PIO address to read
RETURN:
0
REMARKS:
Default PIO long read function. Doesn't perform real inl.
****************************************************************************/
static u32 X86API p_inl(
	X86EMU_pioAddr addr)
{
DB(	if (DEBUG_IO_TRACE())
		printk("inl %#04x \n", addr);)
	return 0;
}

/****************************************************************************
PARAMETERS:
addr	- PIO address to write
val     - Value to store
REMARKS:
Default PIO byte write function. Doesn't perform real outb.
****************************************************************************/
static void X86API p_outb(
	X86EMU_pioAddr addr,
	u8 val)
{
DB(	if (DEBUG_IO_TRACE())
		printk("outb %#02x -> %#04x \n", val, addr);)
    return;
}

/****************************************************************************
PARAMETERS:
addr	- PIO address to write
val     - Value to store
REMARKS:
Default PIO word write function. Doesn't perform real outw.
****************************************************************************/
static void X86API p_outw(
	X86EMU_pioAddr addr,
	u16 val)
{
DB(	if (DEBUG_IO_TRACE())
		printk("outw %#04x -> %#04x \n", val, addr);)
	return;
}

/****************************************************************************
PARAMETERS:
addr	- PIO address to write
val     - Value to store
REMARKS:
Default PIO ;ong write function. Doesn't perform real outl.
****************************************************************************/
static void X86API p_outl(
	X86EMU_pioAddr addr,
	u32 val)
{
DB(	if (DEBUG_IO_TRACE())
		printk("outl %#08x -> %#04x \n", val, addr);)
    return;
}

/*------------------------- Global Variables ------------------------------*/

u8  	(X86APIP sys_rdb)(u32 addr) 			            = rdb;
u16 	(X86APIP sys_rdw)(u32 addr) 			            = rdw;
u32 	(X86APIP sys_rdl)(u32 addr) 			            = rdl;
void 	(X86APIP sys_wrb)(u32 addr,u8 val) 		            = wrb;
void 	(X86APIP sys_wrw)(u32 addr,u16 val) 	            = wrw;
void 	(X86APIP sys_wrl)(u32 addr,u32 val) 	            = wrl;
u8  	(X86APIP sys_inb)(X86EMU_pioAddr addr)	            = p_inb;
u16 	(X86APIP sys_inw)(X86EMU_pioAddr addr)	            = p_inw;
u32 	(X86APIP sys_inl)(X86EMU_pioAddr addr)              = p_inl;
void 	(X86APIP sys_outb)(X86EMU_pioAddr addr, u8 val) 	= p_outb;
void 	(X86APIP sys_outw)(X86EMU_pioAddr addr, u16 val)	= p_outw;
void 	(X86APIP sys_outl)(X86EMU_pioAddr addr, u32 val)	= p_outl;

/*----------------------------- Setup -------------------------------------*/

/****************************************************************************
PARAMETERS:
funcs	- New memory function pointers to make active

REMARKS:
This function is used to set the pointers to functions which access
memory space, allowing the user application to override these functions
and hook them out as necessary for their application.
****************************************************************************/
void X86EMU_setupMemFuncs(
	X86EMU_memFuncs *funcs)
{
	sys_rdb = funcs->rdb;
    sys_rdw = funcs->rdw;
    sys_rdl = funcs->rdl;
    sys_wrb = funcs->wrb;
    sys_wrw = funcs->wrw;
    sys_wrl = funcs->wrl;
}

/****************************************************************************
PARAMETERS:
funcs	- New programmed I/O function pointers to make active

REMARKS:
This function is used to set the pointers to functions which access
I/O space, allowing the user application to override these functions
and hook them out as necessary for their application.
****************************************************************************/
void X86EMU_setupPioFuncs(
	X86EMU_pioFuncs *funcs)
{
    sys_inb = funcs->inb;
    sys_inw = funcs->inw;
    sys_inl = funcs->inl;
    sys_outb = funcs->outb;
    sys_outw = funcs->outw;
    sys_outl = funcs->outl;
}

/****************************************************************************
PARAMETERS:
funcs	- New interrupt vector table to make active

REMARKS:
This function is used to set the pointers to functions which handle
interrupt processing in the emulator, allowing the user application to
hook interrupts as necessary for their application. Any interrupts that
are not hooked by the user application, and reflected and handled internally
in the emulator via the interrupt vector table. This allows the application
to get control when the code being emulated executes specific software
interrupts.
****************************************************************************/
void X86EMU_setupIntrFuncs(
	X86EMU_intrFuncs funcs[])
{
    int i;

	for (i=0; i < 256; i++)
		_X86EMU_intrTab[i] = NULL;
	if (funcs) {
		for (i = 0; i < 256; i++)
			_X86EMU_intrTab[i] = funcs[i];
		}
}

/****************************************************************************
PARAMETERS:
int	- New software interrupt to prepare for

REMARKS:
This function is used to set up the emulator state to exceute a software
interrupt. This can be used by the user application code to allow an
interrupt to be hooked, examined and then reflected back to the emulator
so that the code in the emulator will continue processing the software
interrupt as per normal. This essentially allows system code to actively
hook and handle certain software interrupts as necessary.
****************************************************************************/
void X86EMU_prepareForInt(
	int num)
{
    push_word((u16)M.x86.R_FLG);
    CLEAR_FLAG(F_IF);
    CLEAR_FLAG(F_TF);
    push_word(M.x86.R_CS);
    M.x86.R_CS = mem_access_word(num * 4 + 2);
    push_word(M.x86.R_IP);
    M.x86.R_IP = mem_access_word(num * 4);
	M.x86.intr = 0;
}