cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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bt455.h (1879B)

      1/*
      2 *	linux/drivers/video/bt455.h
      3 *
      4 *	Copyright 2003  Thiemo Seufer <seufer@csv.ica.uni-stuttgart.de>
      5 *	Copyright 2016  Maciej W. Rozycki <macro@linux-mips.org>
      6 *
      7 *	This file is subject to the terms and conditions of the GNU General
      8 *	Public License. See the file COPYING in the main directory of this
      9 *	archive for more details.
     10 */
     11#include <linux/types.h>
     12
     13/*
     14 * Bt455 byte-wide registers, 32-bit aligned.
     15 */
     16struct bt455_regs {
     17	volatile u8 addr_cmap;
     18	u8 pad0[3];
     19	volatile u8 addr_cmap_data;
     20	u8 pad1[3];
     21	volatile u8 addr_clr;
     22	u8 pad2[3];
     23	volatile u8 addr_ovly;
     24	u8 pad3[3];
     25};
     26
     27static inline void bt455_select_reg(struct bt455_regs *regs, int ir)
     28{
     29	mb();
     30	regs->addr_cmap = ir & 0x0f;
     31}
     32
     33static inline void bt455_reset_reg(struct bt455_regs *regs)
     34{
     35	mb();
     36	regs->addr_clr = 0;
     37}
     38
     39/*
     40 * Read/write to a Bt455 color map register.
     41 */
     42static inline void bt455_read_cmap_next(struct bt455_regs *regs, u8 *grey)
     43{
     44	mb();
     45	regs->addr_cmap_data;
     46	rmb();
     47	*grey = regs->addr_cmap_data & 0xf;
     48	rmb();
     49	regs->addr_cmap_data;
     50}
     51
     52static inline void bt455_write_cmap_next(struct bt455_regs *regs, u8 grey)
     53{
     54	wmb();
     55	regs->addr_cmap_data = 0x0;
     56	wmb();
     57	regs->addr_cmap_data = grey & 0xf;
     58	wmb();
     59	regs->addr_cmap_data = 0x0;
     60}
     61
     62static inline void bt455_write_ovly_next(struct bt455_regs *regs, u8 grey)
     63{
     64	wmb();
     65	regs->addr_ovly = 0x0;
     66	wmb();
     67	regs->addr_ovly = grey & 0xf;
     68	wmb();
     69	regs->addr_ovly = 0x0;
     70}
     71
     72static inline void bt455_read_cmap_entry(struct bt455_regs *regs,
     73					 int cr, u8 *grey)
     74{
     75	bt455_select_reg(regs, cr);
     76	bt455_read_cmap_next(regs, grey);
     77}
     78
     79static inline void bt455_write_cmap_entry(struct bt455_regs *regs,
     80					  int cr, u8 grey)
     81{
     82	bt455_select_reg(regs, cr);
     83	bt455_write_cmap_next(regs, grey);
     84}
     85
     86static inline void bt455_write_ovly_entry(struct bt455_regs *regs, u8 grey)
     87{
     88	bt455_reset_reg(regs);
     89	bt455_write_ovly_next(regs, grey);
     90}