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[ARM] tegra: Add function to enable protected aperture

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Change-Id: I699cee3bc9a131259b330655126146f5d1f92043
Signed-off-by: Colin Cross <ccross@android.com>
This commit is contained in:
Colin Cross
2010-10-19 16:12:33 -07:00
parent 9796850a6b
commit 0f712aa808
2 changed files with 31 additions and 0 deletions
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2
arch/arm/mach-tegra/board.h
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@@ -29,6 +29,7 @@ void __init tegra_init_irq(void);
void __init tegra_init_clock(void);
void __init tegra_reserve(unsigned long carveout_size, unsigned long fb_size,
unsigned long fb2_size);
void __init tegra_protected_aperture_init(unsigned long aperture);
extern unsigned long tegra_bootloader_fb_start;
extern unsigned long tegra_bootloader_fb_size;
@@ -40,6 +41,7 @@ extern unsigned long tegra_carveout_start;
extern unsigned long tegra_carveout_size;
extern unsigned long tegra_lp0_vec_start;
extern unsigned long tegra_lp0_vec_size;
extern unsigned long tegra_grhost_aperture;
extern struct sys_timer tegra_timer;
#endif

29
arch/arm/mach-tegra/common.c
View File

@@ -34,6 +34,8 @@
#include "clock.h"
#include "fuse.h"
#define MC_SECURITY_CFG2 0x7c
unsigned long tegra_bootloader_fb_start;
unsigned long tegra_bootloader_fb_size;
unsigned long tegra_fb_start;
@@ -44,6 +46,7 @@ unsigned long tegra_carveout_start;
unsigned long tegra_carveout_size;
unsigned long tegra_lp0_vec_start;
unsigned long tegra_lp0_vec_size;
unsigned long tegra_grhost_aperture;
void (*tegra_reset)(char mode, const char *cmd);
@@ -124,6 +127,23 @@ static int __init tegra_lp0_vec_arg(char *options)
}
early_param("lp0_vec", tegra_lp0_vec_arg);
/*
* Tegra has a protected aperture that prevents access by most non-CPU
* memory masters to addresses above the aperture value. Enabling it
* secures the CPU's memory from the GPU, except through the GART.
*/
void __init tegra_protected_aperture_init(unsigned long aperture)
{
#ifndef CONFIG_NVMAP_ALLOW_SYSMEM
void __iomem *mc_base = IO_ADDRESS(TEGRA_MC_BASE);
pr_info("Enabling Tegra protected aperture at 0x%08lx\n", aperture);
writel(aperture, mc_base + MC_SECURITY_CFG2);
#else
pr_err("Tegra protected aperture disabled because nvmap is using "
"system memory\n");
#endif
}
void __init tegra_reserve(unsigned long carveout_size, unsigned long fb_size,
unsigned long fb2_size)
{
@@ -157,6 +177,15 @@ void __init tegra_reserve(unsigned long carveout_size, unsigned long fb_size,
else
tegra_fb_size = fb_size;
if (tegra_fb_size)
tegra_grhost_aperture = tegra_fb_start;
if (tegra_fb2_size && tegra_fb2_start < tegra_grhost_aperture)
tegra_grhost_aperture = tegra_fb2_start;
if (tegra_carveout_size && tegra_carveout_start < tegra_grhost_aperture)
tegra_grhost_aperture = tegra_carveout_start;
/*
* TODO: We should copy the bootloader's framebuffer to the framebuffer
* allocated above, and then free this one.