diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/cpu/armv7/nonsec_virt.S | 87 | ||||
| -rw-r--r-- | arch/arm/include/asm/armv7.h | 21 | ||||
| -rw-r--r-- | arch/arm/include/asm/gic.h | 17 |
3 files changed, 125 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/nonsec_virt.S b/arch/arm/cpu/armv7/nonsec_virt.S index d11eb2d..3dd60b7 100644 --- a/arch/arm/cpu/armv7/nonsec_virt.S +++ b/arch/arm/cpu/armv7/nonsec_virt.S @@ -23,6 +23,11 @@ */ #include <config.h> +#include <linux/linkage.h> +#include <asm/gic.h> +#include <asm/armv7.h> + +.arch_extension sec /* the vector table for secure state */ _monitor_vectors: @@ -51,3 +56,85 @@ _secure_monitor: mcr p15, 0, r1, c1, c1, 0 @ write SCR (with NS bit set) movs pc, lr @ return to non-secure SVC + +/* + * Switch a core to non-secure state. + * + * 1. initialize the GIC per-core interface + * 2. allow coprocessor access in non-secure modes + * 3. switch the cpu mode (by calling "smc #0") + * + * Called from smp_pen by secondary cores and directly by the BSP. + * Do not assume that the stack is available and only use registers + * r0-r3 and r12. + * + * PERIPHBASE is used to get the GIC address. This could be 40 bits long, + * though, but we check this in C before calling this function. + */ +ENTRY(_nonsec_init) +#ifdef CONFIG_ARM_GIC_BASE_ADDRESS + ldr r2, =CONFIG_ARM_GIC_BASE_ADDRESS +#else + mrc p15, 4, r2, c15, c0, 0 @ read CBAR + bfc r2, #0, #15 @ clear reserved bits +#endif + add r3, r2, #GIC_DIST_OFFSET @ GIC dist i/f offset + mvn r1, #0 @ all bits to 1 + str r1, [r3, #GICD_IGROUPRn] @ allow private interrupts + + mrc p15, 0, r0, c0, c0, 0 @ read MIDR + ldr r1, =MIDR_PRIMARY_PART_MASK + and r0, r0, r1 @ mask out variant and revision + + ldr r1, =MIDR_CORTEX_A7_R0P0 & MIDR_PRIMARY_PART_MASK + cmp r0, r1 @ check for Cortex-A7 + + ldr r1, =MIDR_CORTEX_A15_R0P0 & MIDR_PRIMARY_PART_MASK + cmpne r0, r1 @ check for Cortex-A15 + + movne r1, #GIC_CPU_OFFSET_A9 @ GIC CPU offset for A9 + moveq r1, #GIC_CPU_OFFSET_A15 @ GIC CPU offset for A15/A7 + add r3, r2, r1 @ r3 = GIC CPU i/f addr + + mov r1, #1 @ set GICC_CTLR[enable] + str r1, [r3, #GICC_CTLR] @ and clear all other bits + mov r1, #0xff + str r1, [r3, #GICC_PMR] @ set priority mask register + + movw r1, #0x3fff + movt r1, #0x0006 + mcr p15, 0, r1, c1, c1, 2 @ NSACR = all copros to non-sec + +/* The CNTFRQ register of the generic timer needs to be + * programmed in secure state. Some primary bootloaders / firmware + * omit this, so if the frequency is provided in the configuration, + * we do this here instead. + * But first check if we have the generic timer. + */ +#ifdef CONFIG_SYS_CLK_FREQ + mrc p15, 0, r0, c0, c1, 1 @ read ID_PFR1 + and r0, r0, #CPUID_ARM_GENTIMER_MASK @ mask arch timer bits + cmp r0, #(1 << CPUID_ARM_GENTIMER_SHIFT) + ldreq r1, =CONFIG_SYS_CLK_FREQ + mcreq p15, 0, r1, c14, c0, 0 @ write CNTFRQ +#endif + + adr r1, _monitor_vectors + mcr p15, 0, r1, c12, c0, 1 @ set MVBAR to secure vectors + + mrc p15, 0, ip, c12, c0, 0 @ save secure copy of VBAR + + isb + smc #0 @ call into MONITOR mode + + mcr p15, 0, ip, c12, c0, 0 @ write non-secure copy of VBAR + + mov r1, #1 + str r1, [r3, #GICC_CTLR] @ enable non-secure CPU i/f + add r2, r2, #GIC_DIST_OFFSET + str r1, [r2, #GICD_CTLR] @ allow private interrupts + + mov r0, r3 @ return GICC address + + bx lr +ENDPROC(_nonsec_init) 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 |