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
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@ -70,6 +70,7 @@ struct pflash_t {
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QEMUTimer *timer;
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ram_addr_t off;
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int fl_mem;
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int rom_mode;
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void *storage;
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};
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@ -80,6 +81,7 @@ static void pflash_register_memory(pflash_t *pfl, int rom_mode)
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if (rom_mode)
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phys_offset |= pfl->off | IO_MEM_ROMD;
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pfl->rom_mode = rom_mode;
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for (i = 0; i < pfl->mappings; i++)
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cpu_register_physical_memory(pfl->base + i * pfl->chip_len,
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@ -110,7 +112,13 @@ static uint32_t pflash_read (pflash_t *pfl, uint32_t offset, int width)
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DPRINTF("%s: offset " TARGET_FMT_lx "\n", __func__, offset);
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ret = -1;
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offset -= pfl->base;
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if (pfl->rom_mode) {
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offset -= (uint32_t)(long)pfl->storage;
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/* Lazy reset of to ROMD mode */
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if (pfl->wcycle == 0)
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pflash_register_memory(pfl, 1);
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} else
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offset -= pfl->base;
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offset &= pfl->chip_len - 1;
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boff = offset & 0xFF;
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if (pfl->width == 2)
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@ -224,8 +232,6 @@ static void pflash_write (pflash_t *pfl, uint32_t offset, uint32_t value,
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uint8_t *p;
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uint8_t cmd;
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/* WARNING: when the memory area is in ROMD mode, the offset is a
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ram offset, not a physical address */
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cmd = value;
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if (pfl->cmd != 0xA0 && cmd == 0xF0) {
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#if 0
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@ -236,7 +242,9 @@ static void pflash_write (pflash_t *pfl, uint32_t offset, uint32_t value,
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}
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DPRINTF("%s: offset " TARGET_FMT_lx " %08x %d %d\n", __func__,
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offset, value, width, pfl->wcycle);
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if (pfl->wcycle == 0)
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/* WARNING: when the memory area is in ROMD mode, the offset is a
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ram offset, not a physical address */
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if (pfl->rom_mode)
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offset -= (uint32_t)(long)pfl->storage;
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else
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offset -= pfl->base;
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@ -251,8 +259,9 @@ static void pflash_write (pflash_t *pfl, uint32_t offset, uint32_t value,
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boff = boff >> 2;
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switch (pfl->wcycle) {
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case 0:
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/* Set the device in I/O access mode */
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pflash_register_memory(pfl, 0);
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/* Set the device in I/O access mode if required */
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if (pfl->rom_mode)
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pflash_register_memory(pfl, 0);
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/* We're in read mode */
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check_unlock0:
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if (boff == 0x55 && cmd == 0x98) {
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@ -439,7 +448,6 @@ static void pflash_write (pflash_t *pfl, uint32_t offset, uint32_t value,
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/* Reset flash */
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reset_flash:
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pflash_register_memory(pfl, 1);
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pfl->bypass = 0;
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pfl->wcycle = 0;
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pfl->cmd = 0;
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