vga.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 *	Access to VGA videoram
 4 *
 5 *	(c) 1998 Martin Mares <mj@ucw.cz>
 6 */
 7
 8#ifndef _LINUX_ASM_VGA_H_
 9#define _LINUX_ASM_VGA_H_
10
11#include <asm/io.h>
12
13#define VT_BUF_HAVE_RW
14#define VT_BUF_HAVE_MEMSETW
15#define VT_BUF_HAVE_MEMCPYW
16#define VT_BUF_HAVE_MEMMOVEW
17
18static inline void scr_writew(u16 val, volatile u16 *addr)
19{
20	if (__is_ioaddr(addr))
21		__raw_writew(val, (volatile u16 __iomem *) addr);
22	else
23		*addr = val;
24}
25
26static inline u16 scr_readw(volatile const u16 *addr)
27{
28	if (__is_ioaddr(addr))
29		return __raw_readw((volatile const u16 __iomem *) addr);
30	else
31		return *addr;
32}
33
34static inline void scr_memsetw(u16 *s, u16 c, unsigned int count)
35{
36	if (__is_ioaddr(s))
37		memsetw_io((u16 __iomem *) s, c, count);
38	else
39		memset16(s, c, count / 2);
40}
41
42/* Do not trust that the usage will be correct; analyze the arguments.  */
43extern void scr_memcpyw(u16 *d, const u16 *s, unsigned int count);
44extern void scr_memmovew(u16 *d, const u16 *s, unsigned int count);
45
46/* ??? These are currently only used for downloading character sets.  As
47   such, they don't need memory barriers.  Is this all they are intended
48   to be used for?  */
49#define vga_readb(a)	readb((u8 __iomem *)(a))
50#define vga_writeb(v,a)	writeb(v, (u8 __iomem *)(a))
51
52#ifdef CONFIG_VGA_HOSE
53#include <linux/ioport.h>
54#include <linux/pci.h>
55
56extern struct pci_controller *pci_vga_hose;
57
58# define __is_port_vga(a)       \
59	(((a) >= 0x3b0) && ((a) < 0x3e0) && \
60	 ((a) != 0x3b3) && ((a) != 0x3d3))
61
62# define __is_mem_vga(a) \
63	(((a) >= 0xa0000) && ((a) <= 0xc0000))
64
65# define FIXUP_IOADDR_VGA(a) do {                       \
66	if (pci_vga_hose && __is_port_vga(a))     \
67		(a) += pci_vga_hose->io_space->start;	  \
68 } while(0)
69
70# define FIXUP_MEMADDR_VGA(a) do {                       \
71	if (pci_vga_hose && __is_mem_vga(a))     \
72		(a) += pci_vga_hose->mem_space->start; \
73 } while(0)
74
75#else /* CONFIG_VGA_HOSE */
76# define pci_vga_hose 0
77# define __is_port_vga(a) 0
78# define __is_mem_vga(a) 0
79# define FIXUP_IOADDR_VGA(a)
80# define FIXUP_MEMADDR_VGA(a)
81#endif /* CONFIG_VGA_HOSE */
82
83#define VGA_MAP_MEM(x,s)	((unsigned long) ioremap(x, s))
84
85#endif