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/*
* PowerMac NVRAM emulation
*
* Copyright (c) 2005-2007 Fabrice Bellard
* Copyright (c) 2007 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 "hw.h"
#include "ppc_mac.h"
struct MacIONVRAMState {
target_phys_addr_t size;
int mem_index;
uint8_t data[0x2000];
};
/* Direct access to NVRAM */
uint32_t macio_nvram_read (void *opaque, uint32_t addr)
{
MacIONVRAMState *s = opaque;
uint32_t ret;
// printf("%s: %p addr %04x\n", __func__, s, addr);
if (addr < 0x2000)
ret = s->data[addr];
else
ret = -1;
return ret;
}
void macio_nvram_write (void *opaque, uint32_t addr, uint32_t val)
{
MacIONVRAMState *s = opaque;
// printf("%s: %p addr %04x val %02x\n", __func__, s, addr, val);
if (addr < 0x2000)
s->data[addr] = val;
}
/* macio style NVRAM device */
static void macio_nvram_writeb (void *opaque,
target_phys_addr_t addr, uint32_t value)
{
MacIONVRAMState *s = opaque;
addr = (addr >> 4) & 0x1fff;
s->data[addr] = value;
// printf("macio_nvram_writeb %04x = %02x\n", addr, value);
}
static uint32_t macio_nvram_readb (void *opaque, target_phys_addr_t addr)
{
MacIONVRAMState *s = opaque;
uint32_t value;
addr = (addr >> 4) & 0x1fff;
value = s->data[addr];
// printf("macio_nvram_readb %04x = %02x\n", addr, value);
return value;
}
static CPUWriteMemoryFunc *nvram_write[] = {
&macio_nvram_writeb,
&macio_nvram_writeb,
&macio_nvram_writeb,
};
static CPUReadMemoryFunc *nvram_read[] = {
&macio_nvram_readb,
&macio_nvram_readb,
&macio_nvram_readb,
};
MacIONVRAMState *macio_nvram_init (int *mem_index, target_phys_addr_t size)
{
MacIONVRAMState *s;
s = qemu_mallocz(sizeof(MacIONVRAMState));
if (!s)
return NULL;
s->size = size;
s->mem_index = cpu_register_io_memory(0, nvram_read, nvram_write, s);
*mem_index = s->mem_index;
return s;
}
void macio_nvram_map (void *opaque, target_phys_addr_t mem_base)
{
MacIONVRAMState *s;
s = opaque;
cpu_register_physical_memory(mem_base, s->size, s->mem_index);
}
static uint8_t nvram_chksum (const uint8_t *buf, int n)
{
int sum, i;
sum = 0;
for(i = 0; i < n; i++)
sum += buf[i];
return (sum & 0xff) + (sum >> 8);
}
/* set a free Mac OS NVRAM partition */
void pmac_format_nvram_partition (MacIONVRAMState *nvr, int len)
{
uint8_t *buf;
char partition_name[12] = "wwwwwwwwwwww";
buf = nvr->data;
buf[0] = 0x7f; /* free partition magic */
buf[1] = 0; /* checksum */
buf[2] = len >> 8;
buf[3] = len;
memcpy(buf + 4, partition_name, 12);
buf[1] = nvram_chksum(buf, 16);
}
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