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authorArnd Bergmann <arnd@arndb.de>2009-05-13 22:56:34 +0000
committerArnd Bergmann <arnd@klappe2.(none)>2009-06-11 21:02:42 +0200
commitae49e807951d5e26767bc55d1dc29671c596c450 (patch)
treefca4fedd8797c45b1f30299da49ebf3b5a982ec1 /include/asm-generic/vga.h
parentaafe4dbed0bf6cbdb2e9f03e1d42f8a540d8541d (diff)
asm-generic: add legacy I/O header files
The dma.h, hw_irq.h, serial.h and timex.h files originally described PC-style i8237, i8259A, i8250, i8253 and i8255 chips as well as the VGA style text mode graphics. Modern architectures live happily without these specific interfaces, but a few definitions from these headers keep getting used in common code. The new generic headers are what most architectures use anyway nowadays, just implementing the minimal definitions. Signed-off-by: Remis Lima Baima <remis.developer@googlemail.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'include/asm-generic/vga.h')
-rw-r--r--include/asm-generic/vga.h24
1 files changed, 24 insertions, 0 deletions
diff --git a/include/asm-generic/vga.h b/include/asm-generic/vga.h
new file mode 100644
index 00000000000..36c8ff52016
--- /dev/null
+++ b/include/asm-generic/vga.h
@@ -0,0 +1,24 @@
+/*
+ * Access to VGA videoram
+ *
+ * (c) 1998 Martin Mares <mj@ucw.cz>
+ */
+#ifndef __ASM_GENERIC_VGA_H
+#define __ASM_GENERIC_VGA_H
+
+/*
+ * On most architectures that support VGA, we can just
+ * recalculate addresses and then access the videoram
+ * directly without any black magic.
+ *
+ * Everyone else needs to ioremap the address and use
+ * proper I/O accesses.
+ */
+#ifndef VGA_MAP_MEM
+#define VGA_MAP_MEM(x, s) (unsigned long)phys_to_virt(x)
+#endif
+
+#define vga_readb(x) (*(x))
+#define vga_writeb(x, y) (*(y) = (x))
+
+#endif /* _ASM_GENERIC_VGA_H */