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Banshee: Attempt to implement 8 and 16 byte writes to CMDFIFO.

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- The mem_write_handler() splits 16 bytes writes in two 8 bytes writes.
- In mem_write() the 8 byte writes to CMDFIFO are split in two 32-bit writes.
This commit is contained in:
Volker Ruppert 2024-01-12 18:56:49 +01:00
parent 75fe93bc03
commit 5b6872168a
1 changed files with 18 additions and 1 deletions
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19
bochs/iodev/display/banshee.cc
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@ -822,7 +822,18 @@ bool bx_banshee_c::mem_write_handler(bx_phy_address addr, unsigned len,
void *data, void *param)
{
bx_banshee_c *class_ptr = (bx_banshee_c*)param;
class_ptr->mem_write(addr, len, data);
if (len == 16) {
Bit64u *data64 = (Bit64u*)data;
#ifdef BX_LITTLE_ENDIAN
class_ptr->mem_write(addr, 8, &data64[0]);
class_ptr->mem_write(addr + 8, 8, &data64[1]);
#else
class_ptr->mem_write(addr, 8, &data64[1]);
class_ptr->mem_write(addr + 8, 8, &data64[0]);
#endif
} else {
class_ptr->mem_write(addr, len, data);
}
return 1;
}
@ -963,6 +974,9 @@ void bx_banshee_c::mem_write(bx_phy_address addr, unsigned len, void *data)
(offset < v->fbi.cmdfifo[0].end)) {
if (len == 4) {
cmdfifo_w(&v->fbi.cmdfifo[0], offset, value);
} else if (len == 8) {
cmdfifo_w(&v->fbi.cmdfifo[0], offset, value);
cmdfifo_w(&v->fbi.cmdfifo[0], offset + 4, value >> 32);
} else {
BX_ERROR(("CMDFIFO #0 write with len = %d redirected to LFB", len));
mem_write_linear(offset, value, len);
@ -971,6 +985,9 @@ void bx_banshee_c::mem_write(bx_phy_address addr, unsigned len, void *data)
(offset < v->fbi.cmdfifo[1].end)) {
if (len == 4) {
cmdfifo_w(&v->fbi.cmdfifo[1], offset, value);
} else if (len == 8) {
cmdfifo_w(&v->fbi.cmdfifo[1], offset, value);
cmdfifo_w(&v->fbi.cmdfifo[1], offset + 4, value >> 32);
} else {
BX_ERROR(("CMDFIFO #1 write with len = %d redirected to LFB", len));
mem_write_linear(offset, value, len);