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Some changes for the Bochs VBE 32k bank granularity feature.

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- VBE enable register returns 32k granularity flag if enabled.
- VBE bank register returns 32k granularity flag if VBE_DISPI_GETCAPS is set.
- Defining new DISPI ID not necessary.
- TODO: update VGABIOS to use this feature.
This commit is contained in:
Volker Ruppert 2021-05-23 06:30:51 +00:00
parent d9273a2414
commit 8cbf4eff8e
2 changed files with 8 additions and 4 deletions
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11
bochs/iodev/display/vga.cc
View File

@ -856,10 +856,16 @@ Bit32u bx_vga_c::vbe_read(Bit32u address, unsigned io_len)
retval |= VBE_DISPI_GETCAPS;
if (BX_VGA_THIS vbe.dac_8bit)
retval |= VBE_DISPI_8BIT_DAC;
if (BX_VGA_THIS vbe.bank_granularity_kb == 32)
retval |= VBE_DISPI_BANK_GRANULARITY_32K;
return retval;
case VBE_DISPI_INDEX_BANK: // current bank
return BX_VGA_THIS vbe.bank;
if (BX_VGA_THIS vbe.get_capabilities) {
return (VBE_DISPI_BANK_GRANULARITY_32K << 8);
} else {
return BX_VGA_THIS vbe.bank;
}
case VBE_DISPI_INDEX_X_OFFSET:
return BX_VGA_THIS vbe.offset_x;
@ -931,8 +937,7 @@ Bit32u bx_vga_c::vbe_write(Bit32u address, Bit32u value, unsigned io_len)
(value == VBE_DISPI_ID2) ||
(value == VBE_DISPI_ID3) ||
(value == VBE_DISPI_ID4) ||
(value == VBE_DISPI_ID5) ||
(value == VBE_DISPI_ID6))
(value == VBE_DISPI_ID5))
{
// allow backwards compatible with previous dispi bioses
BX_VGA_THIS vbe.cur_dispi=value;

1
bochs/iodev/display/vga.h
View File

@ -57,7 +57,6 @@
#define VBE_DISPI_ID3 0xB0C3
#define VBE_DISPI_ID4 0xB0C4
#define VBE_DISPI_ID5 0xB0C5
#define VBE_DISPI_ID6 0xB0C6
#define VBE_DISPI_BPP_4 0x04
#define VBE_DISPI_BPP_8 0x08