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authorAndre Przywara <andre.przywara@linaro.org>2013-09-19 18:06:41 +0200
committerAlbert ARIBAUD <albert.u.boot@aribaud.net>2013-10-03 21:28:25 +0200
commit16212b594f385bd594d5d316bf11b13c1186e3d7 (patch)
treec81796603104c9a9ca345ace702b01bb74d6f543 /arch/arm/include/asm
parent45b940d6f9a9d4989452ea67480e299bfa51ee19 (diff)
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ARM: add assembly routine to switch to non-secure state
While actually switching to non-secure state is one thing, another part of this process is to make sure that we still have full access to the interrupt controller (GIC). The GIC is fully aware of secure vs. non-secure state, some registers are banked, others may be configured to be accessible from secure state only. To be as generic as possible, we get the GIC memory mapped address based on the PERIPHBASE value in the CBAR register. Since this register is not architecturally defined, we check the MIDR before to be from an A15 or A7. For CPUs not having the CBAR or boards with wrong information herein we allow providing the base address as a configuration variable. Now that we know the GIC address, we: a) allow private interrupts to be delivered to the core (GICD_IGROUPR0 = 0xFFFFFFFF) b) enable the CPU interface (GICC_CTLR[0] = 1) c) set the priority filter to allow non-secure interrupts (GICC_PMR = 0xFF) Also we allow access to all coprocessor interfaces from non-secure state by writing the appropriate bits in the NSACR register. The generic timer base frequency register is only accessible from secure state, so we have to program it now. Actually this should be done from primary firmware before, but some boards seems to omit this, so if needed we do this here with a board specific value. The Versatile Express board does not need this, so we remove the frequency from the configuration file here. After having switched to non-secure state, we also enable the non-secure GIC CPU interface, since this register is banked. Since we need to call this routine also directly from the smp_pen later (where we don't have any stack), we can only use caller saved registers r0-r3 and r12 to not mess with the compiler. Signed-off-by: Andre Przywara <andre.przywara@linaro.org>
Diffstat (limited to 'arch/arm/include/asm')
-rw-r--r--arch/arm/include/asm/armv7.h21
-rw-r--r--arch/arm/include/asm/gic.h17
2 files changed, 38 insertions, 0 deletions
diff --git a/arch/arm/include/asm/armv7.h b/arch/arm/include/asm/armv7.h
index 0f7cbbf..3dcfc8f 100644
--- a/arch/arm/include/asm/armv7.h
+++ b/arch/arm/include/asm/armv7.h
@@ -18,6 +18,22 @@
#define MIDR_CORTEX_A15_R0P0 0x410FC0F0
#define MIDR_CORTEX_A15_R2P2 0x412FC0F2
+/* Cortex-A7 revisions */
+#define MIDR_CORTEX_A7_R0P0 0x410FC070
+
+#define MIDR_PRIMARY_PART_MASK 0xFF0FFFF0
+
+/* ID_PFR1 feature fields */
+#define CPUID_ARM_SEC_SHIFT 4
+#define CPUID_ARM_SEC_MASK (0xF << CPUID_ARM_SEC_SHIFT)
+#define CPUID_ARM_VIRT_SHIFT 12
+#define CPUID_ARM_VIRT_MASK (0xF << CPUID_ARM_VIRT_SHIFT)
+#define CPUID_ARM_GENTIMER_SHIFT 16
+#define CPUID_ARM_GENTIMER_MASK (0xF << CPUID_ARM_GENTIMER_SHIFT)
+
+/* valid bits in CBAR register / PERIPHBASE value */
+#define CBAR_MASK 0xFFFF8000
+
/* CCSIDR */
#define CCSIDR_LINE_SIZE_OFFSET 0
#define CCSIDR_LINE_SIZE_MASK 0x7
@@ -60,6 +76,11 @@ void v7_outer_cache_inval_all(void);
void v7_outer_cache_flush_range(u32 start, u32 end);
void v7_outer_cache_inval_range(u32 start, u32 end);
+#ifdef CONFIG_ARMV7_NONSEC
+/* defined in assembly file */
+unsigned int _nonsec_init(void);
+#endif /* CONFIG_ARMV7_NONSEC */
+
#endif /* ! __ASSEMBLY__ */
#endif
diff --git a/arch/arm/include/asm/gic.h b/arch/arm/include/asm/gic.h
new file mode 100644
index 0000000..c2b1e28
--- /dev/null
+++ b/arch/arm/include/asm/gic.h
@@ -0,0 +1,17 @@
+#ifndef __GIC_V2_H__
+#define __GIC_V2_H__
+
+/* register offsets for the ARM generic interrupt controller (GIC) */
+
+#define GIC_DIST_OFFSET 0x1000
+#define GICD_CTLR 0x0000
+#define GICD_TYPER 0x0004
+#define GICD_IGROUPRn 0x0080
+#define GICD_SGIR 0x0F00
+
+#define GIC_CPU_OFFSET_A9 0x0100
+#define GIC_CPU_OFFSET_A15 0x2000
+#define GICC_CTLR 0x0000
+#define GICC_PMR 0x0004
+
+#endif