diff options
author | Marc Zyngier <marc.zyngier@arm.com> | 2014-07-12 14:24:03 +0100 |
---|---|---|
committer | Albert ARIBAUD <albert.u.boot@aribaud.net> | 2014-07-28 17:19:09 +0200 |
commit | f510aeae689925a660bff14683eef4147785d271 (patch) | |
tree | c64b78f6ed747616c80e52c7c20e2508fca652f1 /arch/arm/cpu | |
parent | bf433afd60ce2ccd1bec3cf14150323be8272ac3 (diff) | |
download | u-boot-imx-f510aeae689925a660bff14683eef4147785d271.zip u-boot-imx-f510aeae689925a660bff14683eef4147785d271.tar.gz u-boot-imx-f510aeae689925a660bff14683eef4147785d271.tar.bz2 |
ARM: HYP/non-sec: allow relocation to secure RAM
The current non-sec switching code suffers from one major issue:
it cannot run in secure RAM, as a large part of u-boot still needs
to be run while we're switched to non-secure.
This patch reworks the whole HYP/non-secure strategy by:
- making sure the secure code is the *last* thing u-boot executes
before entering the payload
- performing an exception return from secure mode directly into
the payload
- allowing the code to be dynamically relocated to secure RAM
before switching to non-secure.
This involves quite a bit of horrible code, specially as u-boot
relocation is quite primitive.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
Diffstat (limited to 'arch/arm/cpu')
-rw-r--r-- | arch/arm/cpu/armv7/nonsec_virt.S | 161 | ||||
-rw-r--r-- | arch/arm/cpu/armv7/virt-v7.c | 59 |
2 files changed, 96 insertions, 124 deletions
diff --git a/arch/arm/cpu/armv7/nonsec_virt.S b/arch/arm/cpu/armv7/nonsec_virt.S index b5c946f..2a43e3c 100644 --- a/arch/arm/cpu/armv7/nonsec_virt.S +++ b/arch/arm/cpu/armv7/nonsec_virt.S @@ -10,10 +10,13 @@ #include <linux/linkage.h> #include <asm/gic.h> #include <asm/armv7.h> +#include <asm/proc-armv/ptrace.h> .arch_extension sec .arch_extension virt + .pushsection ._secure.text, "ax" + .align 5 /* the vector table for secure state and HYP mode */ _monitor_vectors: @@ -22,51 +25,86 @@ _monitor_vectors: adr pc, _secure_monitor .word 0 .word 0 - adr pc, _hyp_trap + .word 0 .word 0 .word 0 +.macro is_cpu_virt_capable tmp + mrc p15, 0, \tmp, c0, c1, 1 @ read ID_PFR1 + and \tmp, \tmp, #CPUID_ARM_VIRT_MASK @ mask virtualization bits + cmp \tmp, #(1 << CPUID_ARM_VIRT_SHIFT) +.endm + /* * secure monitor handler * U-boot calls this "software interrupt" in start.S * This is executed on a "smc" instruction, we use a "smc #0" to switch * to non-secure state. - * We use only r0 and r1 here, due to constraints in the caller. + * r0, r1, r2: passed to the callee + * ip: target PC */ _secure_monitor: - mrc p15, 0, r1, c1, c1, 0 @ read SCR - bic r1, r1, #0x4e @ clear IRQ, FIQ, EA, nET bits - orr r1, r1, #0x31 @ enable NS, AW, FW bits + mrc p15, 0, r5, c1, c1, 0 @ read SCR + bic r5, r5, #0x4e @ clear IRQ, FIQ, EA, nET bits + orr r5, r5, #0x31 @ enable NS, AW, FW bits - mrc p15, 0, r0, c0, c1, 1 @ read ID_PFR1 - and r0, r0, #CPUID_ARM_VIRT_MASK @ mask virtualization bits - cmp r0, #(1 << CPUID_ARM_VIRT_SHIFT) + mov r6, #SVC_MODE @ default mode is SVC + is_cpu_virt_capable r4 #ifdef CONFIG_ARMV7_VIRT - orreq r1, r1, #0x100 @ allow HVC instruction + orreq r5, r5, #0x100 @ allow HVC instruction + moveq r6, #HYP_MODE @ Enter the kernel as HYP #endif - mcr p15, 0, r1, c1, c1, 0 @ write SCR (with NS bit set) + mcr p15, 0, r5, c1, c1, 0 @ write SCR (with NS bit set) isb -#ifdef CONFIG_ARMV7_VIRT - mrceq p15, 0, r0, c12, c0, 1 @ get MVBAR value - mcreq p15, 4, r0, c12, c0, 0 @ write HVBAR -#endif bne 1f @ Reset CNTVOFF to 0 before leaving monitor mode - mrc p15, 0, r0, c0, c1, 1 @ read ID_PFR1 - ands r0, r0, #CPUID_ARM_GENTIMER_MASK @ test arch timer bits - movne r0, #0 - mcrrne p15, 4, r0, r0, c14 @ Reset CNTVOFF to zero + mrc p15, 0, r4, c0, c1, 1 @ read ID_PFR1 + ands r4, r4, #CPUID_ARM_GENTIMER_MASK @ test arch timer bits + movne r4, #0 + mcrrne p15, 4, r4, r4, c14 @ Reset CNTVOFF to zero 1: - movs pc, lr @ return to non-secure SVC - -_hyp_trap: - mrs lr, elr_hyp @ for older asm: .byte 0x00, 0xe3, 0x0e, 0xe1 - mov pc, lr @ do no switch modes, but - @ return to caller - + mov lr, ip + mov ip, #(F_BIT | I_BIT | A_BIT) @ Set A, I and F + tst lr, #1 @ Check for Thumb PC + orrne ip, ip, #T_BIT @ Set T if Thumb + orr ip, ip, r6 @ Slot target mode in + msr spsr_cxfs, ip @ Set full SPSR + movs pc, lr @ ERET to non-secure + +ENTRY(_do_nonsec_entry) + mov ip, r0 + mov r0, r1 + mov r1, r2 + mov r2, r3 + smc #0 +ENDPROC(_do_nonsec_entry) + +.macro get_cbar_addr addr +#ifdef CONFIG_ARM_GIC_BASE_ADDRESS + ldr \addr, =CONFIG_ARM_GIC_BASE_ADDRESS +#else + mrc p15, 4, \addr, c15, c0, 0 @ read CBAR + bfc \addr, #0, #15 @ clear reserved bits +#endif +.endm + +.macro get_gicd_addr addr + get_cbar_addr \addr + add \addr, \addr, #GIC_DIST_OFFSET @ GIC dist i/f offset +.endm + +.macro get_gicc_addr addr, tmp + get_cbar_addr \addr + is_cpu_virt_capable \tmp + movne \tmp, #GIC_CPU_OFFSET_A9 @ GIC CPU offset for A9 + moveq \tmp, #GIC_CPU_OFFSET_A15 @ GIC CPU offset for A15/A7 + add \addr, \addr, \tmp +.endm + +#ifndef CONFIG_ARMV7_PSCI /* * Secondary CPUs start here and call the code for the core specific parts * of the non-secure and HYP mode transition. The GIC distributor specific @@ -74,31 +112,21 @@ _hyp_trap: * Then they go back to wfi and wait to be woken up by the kernel again. */ ENTRY(_smp_pen) - mrs r0, cpsr - orr r0, r0, #0xc0 - msr cpsr, r0 @ disable interrupts - ldr r1, =_start - mcr p15, 0, r1, c12, c0, 0 @ set VBAR + cpsid i + cpsid f bl _nonsec_init - mov r12, r0 @ save GICC address -#ifdef CONFIG_ARMV7_VIRT - bl _switch_to_hyp -#endif - - ldr r1, [r12, #GICC_IAR] @ acknowledge IPI - str r1, [r12, #GICC_EOIR] @ signal end of interrupt adr r0, _smp_pen @ do not use this address again b smp_waitloop @ wait for IPIs, board specific ENDPROC(_smp_pen) +#endif /* * 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 @@ -108,38 +136,23 @@ ENDPROC(_smp_pen) * 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 + get_gicd_addr r3 + 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 + get_gicc_addr r3, r1 - 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] + mov r1, #3 @ Enable both groups str r1, [r3, #GICC_CTLR] @ and clear all other bits mov r1, #0xff str r1, [r3, #GICC_PMR] @ set priority mask register + mrc p15, 0, r0, c1, c1, 2 movw r1, #0x3fff - movt r1, #0x0006 - mcr p15, 0, r1, c1, c1, 2 @ NSACR = all copros to non-sec + movt r1, #0x0004 + orr r0, r0, r1 + mcr p15, 0, r0, 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 @@ -157,21 +170,9 @@ ENTRY(_nonsec_init) 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) @@ -183,18 +184,10 @@ ENTRY(smp_waitloop) ldr r1, [r1] cmp r0, r1 @ make sure we dont execute this code beq smp_waitloop @ again (due to a spurious wakeup) - mov pc, r1 + mov r0, r1 + b _do_nonsec_entry ENDPROC(smp_waitloop) .weak smp_waitloop #endif -ENTRY(_switch_to_hyp) - mov r0, lr - mov r1, sp @ save SVC copy of LR and SP - isb - hvc #0 @ for older asm: .byte 0x70, 0x00, 0x40, 0xe1 - mov sp, r1 - mov lr, r0 @ restore SVC copy of LR and SP - - bx lr -ENDPROC(_switch_to_hyp) + .popsection diff --git a/arch/arm/cpu/armv7/virt-v7.c b/arch/arm/cpu/armv7/virt-v7.c index 2cd604f..6500030 100644 --- a/arch/arm/cpu/armv7/virt-v7.c +++ b/arch/arm/cpu/armv7/virt-v7.c @@ -13,17 +13,10 @@ #include <asm/armv7.h> #include <asm/gic.h> #include <asm/io.h> +#include <asm/secure.h> unsigned long gic_dist_addr; -static unsigned int read_cpsr(void) -{ - unsigned int reg; - - asm volatile ("mrs %0, cpsr\n" : "=r" (reg)); - return reg; -} - static unsigned int read_id_pfr1(void) { unsigned int reg; @@ -72,6 +65,18 @@ static unsigned long get_gicd_base_address(void) #endif } +static void relocate_secure_section(void) +{ +#ifdef CONFIG_ARMV7_SECURE_BASE + size_t sz = __secure_end - __secure_start; + + memcpy((void *)CONFIG_ARMV7_SECURE_BASE, __secure_start, sz); + flush_dcache_range(CONFIG_ARMV7_SECURE_BASE, + CONFIG_ARMV7_SECURE_BASE + sz + 1); + invalidate_icache_all(); +#endif +} + static void kick_secondary_cpus_gic(unsigned long gicdaddr) { /* kick all CPUs (except this one) by writing to GICD_SGIR */ @@ -83,35 +88,7 @@ void __weak smp_kick_all_cpus(void) kick_secondary_cpus_gic(gic_dist_addr); } -int armv7_switch_hyp(void) -{ - unsigned int reg; - - /* check whether we are in HYP mode already */ - if ((read_cpsr() & 0x1f) == 0x1a) { - debug("CPU already in HYP mode\n"); - return 0; - } - - /* check whether the CPU supports the virtualization extensions */ - reg = read_id_pfr1(); - if ((reg & CPUID_ARM_VIRT_MASK) != 1 << CPUID_ARM_VIRT_SHIFT) { - printf("HYP mode: Virtualization extensions not implemented.\n"); - return -1; - } - - /* call the HYP switching code on this CPU also */ - _switch_to_hyp(); - - if ((read_cpsr() & 0x1F) != 0x1a) { - printf("HYP mode: switch not successful.\n"); - return -1; - } - - return 0; -} - -int armv7_switch_nonsec(void) +int armv7_init_nonsec(void) { unsigned int reg; unsigned itlinesnr, i; @@ -147,11 +124,13 @@ int armv7_switch_nonsec(void) for (i = 1; i <= itlinesnr; i++) writel((unsigned)-1, gic_dist_addr + GICD_IGROUPRn + 4 * i); - smp_set_core_boot_addr((unsigned long)_smp_pen, -1); +#ifndef CONFIG_ARMV7_PSCI + smp_set_core_boot_addr((unsigned long)secure_ram_addr(_smp_pen), -1); smp_kick_all_cpus(); +#endif /* call the non-sec switching code on this CPU also */ - _nonsec_init(); - + relocate_secure_section(); + secure_ram_addr(_nonsec_init)(); return 0; } |