--- /dev/null
+/*
+ * code for switching cores into non-secure state and into HYP mode
+ *
+ * Copyright (c) 2013 Andre Przywara <andre.przywara@linaro.org>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <config.h>
+#include <linux/linkage.h>
+#include <asm/gic.h>
+#include <asm/armv7.h>
+
+.arch_extension sec
+.arch_extension virt
+
+/* the vector table for secure state and HYP mode */
+_monitor_vectors:
+ .word 0 /* reset */
+ .word 0 /* undef */
+ adr pc, _secure_monitor
+ .word 0
+ .word 0
+ adr pc, _hyp_trap
+ .word 0
+ .word 0
+
+/*
+ * 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.
+ */
+ .align 5
+_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
+
+#ifdef CONFIG_ARMV7_VIRT
+ 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)
+ orreq r1, r1, #0x100 @ allow HVC instruction
+#endif
+
+ mcr p15, 0, r1, c1, c1, 0 @ write SCR (with NS bit set)
+
+#ifdef CONFIG_ARMV7_VIRT
+ mrceq p15, 0, r0, c12, c0, 1 @ get MVBAR value
+ mcreq p15, 4, r0, c12, c0, 0 @ write HVBAR
+#endif
+
+ 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
+
+/*
+ * 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
+ * code has already been executed by a C function before.
+ * 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
+
+ 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)
+
+/*
+ * 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)
+
+#ifdef CONFIG_SMP_PEN_ADDR
+/* void __weak smp_waitloop(unsigned previous_address); */
+ENTRY(smp_waitloop)
+ wfi
+ ldr r1, =CONFIG_SMP_PEN_ADDR @ load start address
+ 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
+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)
--- /dev/null
+/*
+ * (C) Copyright 2013
+ * Andre Przywara, Linaro
+ *
+ * Routines to transition ARMv7 processors from secure into non-secure state
+ * and from non-secure SVC into HYP mode
+ * needed to enable ARMv7 virtualization for current hypervisors
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <asm/armv7.h>
+#include <asm/gic.h>
+#include <asm/io.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;
+
+ asm("mrc p15, 0, %0, c0, c1, 1\n" : "=r"(reg));
+ return reg;
+}
+
+static unsigned long get_gicd_base_address(void)
+{
+#ifdef CONFIG_ARM_GIC_BASE_ADDRESS
+ return CONFIG_ARM_GIC_BASE_ADDRESS + GIC_DIST_OFFSET;
+#else
+ unsigned midr;
+ unsigned periphbase;
+
+ /* check whether we are an Cortex-A15 or A7.
+ * The actual HYP switch should work with all CPUs supporting
+ * the virtualization extension, but we need the GIC address,
+ * which we know only for sure for those two CPUs.
+ */
+ asm("mrc p15, 0, %0, c0, c0, 0\n" : "=r"(midr));
+ switch (midr & MIDR_PRIMARY_PART_MASK) {
+ case MIDR_CORTEX_A9_R0P1:
+ case MIDR_CORTEX_A15_R0P0:
+ case MIDR_CORTEX_A7_R0P0:
+ break;
+ default:
+ printf("nonsec: could not determine GIC address.\n");
+ return -1;
+ }
+
+ /* get the GIC base address from the CBAR register */
+ asm("mrc p15, 4, %0, c15, c0, 0\n" : "=r" (periphbase));
+
+ /* the PERIPHBASE can be mapped above 4 GB (lower 8 bits used to
+ * encode this). Bail out here since we cannot access this without
+ * enabling paging.
+ */
+ if ((periphbase & 0xff) != 0) {
+ printf("nonsec: PERIPHBASE is above 4 GB, no access.\n");
+ return -1;
+ }
+
+ return (periphbase & CBAR_MASK) + GIC_DIST_OFFSET;
+#endif
+}
+
+static void kick_secondary_cpus_gic(unsigned long gicdaddr)
+{
+ /* kick all CPUs (except this one) by writing to GICD_SGIR */
+ writel(1U << 24, gicdaddr + GICD_SGIR);
+}
+
+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)
+{
+ unsigned int reg;
+ unsigned itlinesnr, i;
+
+ /* check whether the CPU supports the security extensions */
+ reg = read_id_pfr1();
+ if ((reg & 0xF0) == 0) {
+ printf("nonsec: Security extensions not implemented.\n");
+ return -1;
+ }
+
+ /* the SCR register will be set directly in the monitor mode handler,
+ * according to the spec one should not tinker with it in secure state
+ * in SVC mode. Do not try to read it once in non-secure state,
+ * any access to it will trap.
+ */
+
+ gic_dist_addr = get_gicd_base_address();
+ if (gic_dist_addr == -1)
+ return -1;
+
+ /* enable the GIC distributor */
+ writel(readl(gic_dist_addr + GICD_CTLR) | 0x03,
+ gic_dist_addr + GICD_CTLR);
+
+ /* TYPER[4:0] contains an encoded number of available interrupts */
+ itlinesnr = readl(gic_dist_addr + GICD_TYPER) & 0x1f;
+
+ /* set all bits in the GIC group registers to one to allow access
+ * from non-secure state. The first 32 interrupts are private per
+ * CPU and will be set later when enabling the GIC for each core
+ */
+ 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);
+ smp_kick_all_cpus();
+
+ /* call the non-sec switching code on this CPU also */
+ _nonsec_init();
+
+ return 0;
+}
*/
#ifndef ARMV7_H
#define ARMV7_H
-#include <linux/types.h>
/* Cortex-A9 revisions */
#define MIDR_CORTEX_A9_R0P1 0x410FC091
#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
#define ARMV7_CLIDR_CTYPE_INSTRUCTION_DATA 3
#define ARMV7_CLIDR_CTYPE_UNIFIED 4
+#ifndef __ASSEMBLY__
+#include <linux/types.h>
+
/*
* CP15 Barrier instructions
* Please note that we have separate barrier instructions in ARMv7
void v7_outer_cache_flush_range(u32 start, u32 end);
void v7_outer_cache_inval_range(u32 start, u32 end);
+#if defined(CONFIG_ARMV7_NONSEC) || defined(CONFIG_ARMV7_VIRT)
+
+int armv7_switch_nonsec(void);
+int armv7_switch_hyp(void);
+
+/* defined in assembly file */
+unsigned int _nonsec_init(void);
+void _smp_pen(void);
+void _switch_to_hyp(void);
+#endif /* CONFIG_ARMV7_NONSEC || CONFIG_ARMV7_VIRT */
+
+#endif /* ! __ASSEMBLY__ */
+
#endif
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