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Optimize consecutive CFI02 writes by remapping memory lazily (Jan Kiszka). 

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4220 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
balrog 2008-04-16 23:58:02 +00:00
parent 4fbd24ba35
commit 9c9bb6c89d
1 changed files with 15 additions and 7 deletions
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22
hw/pflash_cfi02.c
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@ -70,6 +70,7 @@ struct pflash_t {
QEMUTimer *timer;
ram_addr_t off;
int fl_mem;
int rom_mode;
void *storage;
};
@ -80,6 +81,7 @@ static void pflash_register_memory(pflash_t *pfl, int rom_mode)
if (rom_mode)
phys_offset |= pfl->off | IO_MEM_ROMD;
pfl->rom_mode = rom_mode;
for (i = 0; i < pfl->mappings; i++)
cpu_register_physical_memory(pfl->base + i * pfl->chip_len,
@ -110,7 +112,13 @@ static uint32_t pflash_read (pflash_t *pfl, uint32_t offset, int width)
DPRINTF("%s: offset " TARGET_FMT_lx "\n", __func__, offset);
ret = -1;
offset -= pfl->base;
if (pfl->rom_mode) {
offset -= (uint32_t)(long)pfl->storage;
/* Lazy reset of to ROMD mode */
if (pfl->wcycle == 0)
pflash_register_memory(pfl, 1);
} else
offset -= pfl->base;
offset &= pfl->chip_len - 1;
boff = offset & 0xFF;
if (pfl->width == 2)
@ -224,8 +232,6 @@ static void pflash_write (pflash_t *pfl, uint32_t offset, uint32_t value,
uint8_t *p;
uint8_t cmd;
/* WARNING: when the memory area is in ROMD mode, the offset is a
ram offset, not a physical address */
cmd = value;
if (pfl->cmd != 0xA0 && cmd == 0xF0) {
#if 0
@ -236,7 +242,9 @@ static void pflash_write (pflash_t *pfl, uint32_t offset, uint32_t value,
}
DPRINTF("%s: offset " TARGET_FMT_lx " %08x %d %d\n", __func__,
offset, value, width, pfl->wcycle);
if (pfl->wcycle == 0)
/* WARNING: when the memory area is in ROMD mode, the offset is a
ram offset, not a physical address */
if (pfl->rom_mode)
offset -= (uint32_t)(long)pfl->storage;
else
offset -= pfl->base;
@ -251,8 +259,9 @@ static void pflash_write (pflash_t *pfl, uint32_t offset, uint32_t value,
boff = boff >> 2;
switch (pfl->wcycle) {
case 0:
/* Set the device in I/O access mode */
pflash_register_memory(pfl, 0);
/* Set the device in I/O access mode if required */
if (pfl->rom_mode)
pflash_register_memory(pfl, 0);
/* We're in read mode */
check_unlock0:
if (boff == 0x55 && cmd == 0x98) {
@ -439,7 +448,6 @@ static void pflash_write (pflash_t *pfl, uint32_t offset, uint32_t value,
/* Reset flash */
reset_flash:
pflash_register_memory(pfl, 1);
pfl->bypass = 0;
pfl->wcycle = 0;
pfl->cmd = 0;