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PR/54767: elo: fix incorrect test (mlelstv) 

Add symbolic constants and reference to the standard.
This commit is contained in:
christos 2019-12-15 03:38:17 +00:00
parent 74438c9ae2
commit 6d8018ef1c
1 changed files with 45 additions and 7 deletions
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52
sys/arch/i386/stand/lib/vbe.c
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@ -1,4 +1,4 @@
/* $NetBSD: vbe.c,v 1.9 2017/01/24 11:09:14 nonaka Exp $ */
/* $NetBSD: vbe.c,v 1.10 2019/12/15 03:38:17 christos Exp $ */
/*-
* Copyright (c) 2009 Jared D. McNeill <jmcneill@invisible.ca>
@ -45,19 +45,57 @@ static struct _vbestate {
int modenum;
} vbestate;
/*
* https://pdos.csail.mit.edu/6.828/2018/readings/hardware/vbe3.pdf
* p32
*/
#define VBE_MODEATTR_MODE_HARDWARE_SUPPORTED 0x0001u
#define VBE_MODEATTR_RESERVED_1 0x0002u
#define VBE_MODEATTR_TTY_OUTPUT_FUNCTIONS_SUPPORTED 0x0004u
#define VBE_MODEATTR_COLOR_MODE 0x0008u
#define VBE_MODEATTR_GRAPHICS_MODE 0x0010u
#define VBE_MODEATTR_VGA_COMPATIBLE_MODE 0x0020u
#define VBE_MODEATTR_VGA_COMPATIBLE_WINDOWD_MEMORY_MODE 0x0040u
#define VBE_MODEATTR_LINEAR_FRAME_BUFFER_MODE 0x0080u
#define VBE_MODEATTR_DOUBLE_SCAN_MODE 0x0100u
#define VBE_MODEATTR_INTERLACED_MODE 0x0200u
#define VBE_MODEATTR_HARDWARE_TRIPPLE_BUFFERING_SUPPORT 0x0400u
#define VBE_MODEATTR_HARDWARE_STEREOSCOPIC_SUPPORT 0x0800u
#define VBE_MODEATTR_DUAL_DISPLAY_START_ADDRESS_SUPPORT 0x1000u
#define VBE_MODEATTR_RESERVED_2 0x2000u
#define VBE_MODEATTR_RESERVED_3 0x4000u
#define VBE_MODEATTR_RESERVED_4 0x8000u
/*
* p36
*/
#define VBE_MEMMODEL_TEXT 0x00u
#define VBE_MEMMODEL_CGA 0x01u
#define VBE_MEMMODEL_HERCULES 0x02u
#define VBE_MEMMODEL_PLANAR 0x03u
#define VBE_MEMMODEL_PACKED_PIXEL 0x04u
#define VBE_MEMMODEL_NON_CHAIN_4_256 0x05u
#define VBE_MEMMODEL_DIRECT_COLOR 0x06u
#define VBE_MEMMODEL_YUV 0x07u
/* VESA Reserved 0x08u-0x0fu */
/* OEM Reserved 0x10u-0xffU */
static int
vbe_mode_is_supported(struct modeinfoblock *mi)
{
if ((mi->ModeAttributes & 0x01) == 0)
if ((mi->ModeAttributes & VBE_MODEATTR_MODE_HARDWARE_SUPPORTED) == 0)
return 0; /* mode not supported by hardware */
if ((mi->ModeAttributes & 0x08) == 0)
return 0; /* linear fb not available */
if ((mi->ModeAttributes & 0x10) == 0)
if ((mi->ModeAttributes & VBE_MODEATTR_COLOR_MODE) == 0)
return 0; /* only color modes are supported */
if ((mi->ModeAttributes & VBE_MODEATTR_GRAPHICS_MODE) == 0)
return 0; /* text mode */
if ((mi->ModeAttributes & VBE_MODEATTR_LINEAR_FRAME_BUFFER_MODE) == 0)
return 0; /* linear fb not available */
if (mi->NumberOfPlanes != 1)
return 0; /* planar mode not supported */
if (mi->MemoryModel != 0x04 /* Packed pixel */ &&
mi->MemoryModel != 0x06 /* Direct Color */)
if (mi->MemoryModel != VBE_MEMMODEL_PACKED_PIXEL /* Packed pixel */ &&
mi->MemoryModel != VBE_MEMMODEL_DIRECT_COLOR /* Direct Color */)
return 0; /* unsupported pixel format */
return 1;
}