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qemu/hw/ppc.c

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/*
* QEMU generic PPC hardware System Emulator
*
* Copyright (c) 2003-2004 Jocelyn Mayer
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "vl.h"
#include "m48t59.h"
/*****************************************************************************/
/* PPC time base and decrementer emulation */
//#define DEBUG_TB
struct ppc_tb_t {
/* Time base management */
int64_t tb_offset; /* Compensation */
uint32_t tb_freq; /* TB frequency */
/* Decrementer management */
uint64_t decr_next; /* Tick for next decr interrupt */
struct QEMUTimer *decr_timer;
};
static inline uint64_t cpu_ppc_get_tb (ppc_tb_t *tb_env)
{
/* TB time in tb periods */
return muldiv64(qemu_get_clock(vm_clock) + tb_env->tb_offset,
tb_env->tb_freq, ticks_per_sec);
}
uint32_t cpu_ppc_load_tbl (CPUState *env)
{
ppc_tb_t *tb_env = env->tb_env;
uint64_t tb;
tb = cpu_ppc_get_tb(tb_env);
#ifdef DEBUG_TB
{
static int last_time;
int now;
now = time(NULL);
if (last_time != now) {
last_time = now;
printf("%s: tb=0x%016lx %d %08lx\n",
__func__, tb, now, tb_env->tb_offset);
}
}
#endif
return tb & 0xFFFFFFFF;
}
uint32_t cpu_ppc_load_tbu (CPUState *env)
{
ppc_tb_t *tb_env = env->tb_env;
uint64_t tb;
tb = cpu_ppc_get_tb(tb_env);
#ifdef DEBUG_TB
printf("%s: tb=0x%016lx\n", __func__, tb);
#endif
return tb >> 32;
}
static void cpu_ppc_store_tb (ppc_tb_t *tb_env, uint64_t value)
{
tb_env->tb_offset = muldiv64(value, ticks_per_sec, tb_env->tb_freq)
- qemu_get_clock(vm_clock);
#ifdef DEBUG_TB
printf("%s: tb=0x%016lx offset=%08x\n", __func__, value);
#endif
}
void cpu_ppc_store_tbu (CPUState *env, uint32_t value)
{
ppc_tb_t *tb_env = env->tb_env;
cpu_ppc_store_tb(tb_env,
((uint64_t)value << 32) | cpu_ppc_load_tbl(env));
}
void cpu_ppc_store_tbl (CPUState *env, uint32_t value)
{
ppc_tb_t *tb_env = env->tb_env;
cpu_ppc_store_tb(tb_env,
((uint64_t)cpu_ppc_load_tbu(env) << 32) | value);
}
uint32_t cpu_ppc_load_decr (CPUState *env)
{
ppc_tb_t *tb_env = env->tb_env;
uint32_t decr;
int64_t diff;
diff = tb_env->decr_next - qemu_get_clock(vm_clock);
if (diff >= 0)
decr = muldiv64(diff, tb_env->tb_freq, ticks_per_sec);
else
decr = -muldiv64(-diff, tb_env->tb_freq, ticks_per_sec);
#if defined(DEBUG_TB)
printf("%s: 0x%08x\n", __func__, decr);
#endif
return decr;
}
/* When decrementer expires,
* all we need to do is generate or queue a CPU exception
*/
static inline void cpu_ppc_decr_excp (CPUState *env)
{
/* Raise it */
#ifdef DEBUG_TB
printf("raise decrementer exception\n");
#endif
cpu_interrupt(env, CPU_INTERRUPT_TIMER);
}
static void _cpu_ppc_store_decr (CPUState *env, uint32_t decr,
uint32_t value, int is_excp)
{
ppc_tb_t *tb_env = env->tb_env;
uint64_t now, next;
#ifdef DEBUG_TB
printf("%s: 0x%08x => 0x%08x\n", __func__, decr, value);
#endif
now = qemu_get_clock(vm_clock);
next = now + muldiv64(value, ticks_per_sec, tb_env->tb_freq);
if (is_excp)
next += tb_env->decr_next - now;
if (next == now)
next++;
tb_env->decr_next = next;
/* Adjust timer */
qemu_mod_timer(tb_env->decr_timer, next);
/* If we set a negative value and the decrementer was positive,
* raise an exception.
*/
if ((value & 0x80000000) && !(decr & 0x80000000))
cpu_ppc_decr_excp(env);
}
void cpu_ppc_store_decr (CPUState *env, uint32_t value)
{
_cpu_ppc_store_decr(env, cpu_ppc_load_decr(env), value, 0);
}
static void cpu_ppc_decr_cb (void *opaque)
{
_cpu_ppc_store_decr(opaque, 0x00000000, 0xFFFFFFFF, 1);
}
/* Set up (once) timebase frequency (in Hz) */
ppc_tb_t *cpu_ppc_tb_init (CPUState *env, uint32_t freq)
{
ppc_tb_t *tb_env;
tb_env = qemu_mallocz(sizeof(ppc_tb_t));
if (tb_env == NULL)
return NULL;
env->tb_env = tb_env;
if (tb_env->tb_freq == 0 || 1) {
tb_env->tb_freq = freq;
/* Create new timer */
tb_env->decr_timer =
qemu_new_timer(vm_clock, &cpu_ppc_decr_cb, env);
/* There is a bug in 2.4 kernels:
* if a decrementer exception is pending when it enables msr_ee,
* it's not ready to handle it...
*/
_cpu_ppc_store_decr(env, 0xFFFFFFFF, 0xFFFFFFFF, 0);
}
return tb_env;
}
#if 0
/*****************************************************************************/
/* Handle system reset (for now, just stop emulation) */
void cpu_ppc_reset (CPUState *env)
{
printf("Reset asked... Stop emulation\n");
abort();
}
#endif
/*****************************************************************************/
/* Debug port */
void PPC_debug_write (void *opaque, uint32_t addr, uint32_t val)
{
addr &= 0xF;
switch (addr) {
case 0:
printf("%c", val);
break;
case 1:
printf("\n");
fflush(stdout);
break;
case 2:
printf("Set loglevel to %04x\n", val);
cpu_set_log(val | 0x100);
break;
}
}
/*****************************************************************************/
/* NVRAM helpers */
void NVRAM_set_byte (m48t59_t *nvram, uint32_t addr, uint8_t value)
{
m48t59_write(nvram, addr, value);
}
uint8_t NVRAM_get_byte (m48t59_t *nvram, uint32_t addr)
{
return m48t59_read(nvram, addr);
}
void NVRAM_set_word (m48t59_t *nvram, uint32_t addr, uint16_t value)
{
m48t59_write(nvram, addr, value >> 8);
m48t59_write(nvram, addr + 1, value & 0xFF);
}
uint16_t NVRAM_get_word (m48t59_t *nvram, uint32_t addr)
{
uint16_t tmp;
tmp = m48t59_read(nvram, addr) << 8;
tmp |= m48t59_read(nvram, addr + 1);
return tmp;
}
void NVRAM_set_lword (m48t59_t *nvram, uint32_t addr, uint32_t value)
{
m48t59_write(nvram, addr, value >> 24);
m48t59_write(nvram, addr + 1, (value >> 16) & 0xFF);
m48t59_write(nvram, addr + 2, (value >> 8) & 0xFF);
m48t59_write(nvram, addr + 3, value & 0xFF);
}
uint32_t NVRAM_get_lword (m48t59_t *nvram, uint32_t addr)
{
uint32_t tmp;
tmp = m48t59_read(nvram, addr) << 24;
tmp |= m48t59_read(nvram, addr + 1) << 16;
tmp |= m48t59_read(nvram, addr + 2) << 8;
tmp |= m48t59_read(nvram, addr + 3);
return tmp;
}
void NVRAM_set_string (m48t59_t *nvram, uint32_t addr,
const unsigned char *str, uint32_t max)
{
int i;
for (i = 0; i < max && str[i] != '\0'; i++) {
m48t59_write(nvram, addr + i, str[i]);
}
m48t59_write(nvram, addr + max - 1, '\0');
}
int NVRAM_get_string (m48t59_t *nvram, uint8_t *dst, uint16_t addr, int max)
{
int i;
memset(dst, 0, max);
for (i = 0; i < max; i++) {
dst[i] = NVRAM_get_byte(nvram, addr + i);
if (dst[i] == '\0')
break;
}
return i;
}
static uint16_t NVRAM_crc_update (uint16_t prev, uint16_t value)
{
uint16_t tmp;
uint16_t pd, pd1, pd2;
tmp = prev >> 8;
pd = prev ^ value;
pd1 = pd & 0x000F;
pd2 = ((pd >> 4) & 0x000F) ^ pd1;
tmp ^= (pd1 << 3) | (pd1 << 8);
tmp ^= pd2 | (pd2 << 7) | (pd2 << 12);
return tmp;
}
uint16_t NVRAM_compute_crc (m48t59_t *nvram, uint32_t start, uint32_t count)
{
uint32_t i;
uint16_t crc = 0xFFFF;
int odd;
odd = count & 1;
count &= ~1;
for (i = 0; i != count; i++) {
crc = NVRAM_crc_update(crc, NVRAM_get_word(nvram, start + i));
}
if (odd) {
crc = NVRAM_crc_update(crc, NVRAM_get_byte(nvram, start + i) << 8);
}
return crc;
}
#define CMDLINE_ADDR 0x017ff000
int PPC_NVRAM_set_params (m48t59_t *nvram, uint16_t NVRAM_size,
const unsigned char *arch,
uint32_t RAM_size, int boot_device,
uint32_t kernel_image, uint32_t kernel_size,
const char *cmdline,
uint32_t initrd_image, uint32_t initrd_size,
uint32_t NVRAM_image,
int width, int height, int depth)
{
uint16_t crc;
/* Set parameters for Open Hack'Ware BIOS */
NVRAM_set_string(nvram, 0x00, "QEMU_BIOS", 16);
NVRAM_set_lword(nvram, 0x10, 0x00000002); /* structure v2 */
NVRAM_set_word(nvram, 0x14, NVRAM_size);
NVRAM_set_string(nvram, 0x20, arch, 16);
NVRAM_set_lword(nvram, 0x30, RAM_size);
NVRAM_set_byte(nvram, 0x34, boot_device);
NVRAM_set_lword(nvram, 0x38, kernel_image);
NVRAM_set_lword(nvram, 0x3C, kernel_size);
if (cmdline) {
/* XXX: put the cmdline in NVRAM too ? */
strcpy(phys_ram_base + CMDLINE_ADDR, cmdline);
NVRAM_set_lword(nvram, 0x40, CMDLINE_ADDR);
NVRAM_set_lword(nvram, 0x44, strlen(cmdline));
} else {
NVRAM_set_lword(nvram, 0x40, 0);
NVRAM_set_lword(nvram, 0x44, 0);
}
NVRAM_set_lword(nvram, 0x48, initrd_image);
NVRAM_set_lword(nvram, 0x4C, initrd_size);
NVRAM_set_lword(nvram, 0x50, NVRAM_image);
NVRAM_set_word(nvram, 0x54, width);
NVRAM_set_word(nvram, 0x56, height);
NVRAM_set_word(nvram, 0x58, depth);
crc = NVRAM_compute_crc(nvram, 0x00, 0xF8);
NVRAM_set_word(nvram, 0xFC, crc);
return 0;
}
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