144 lines
3.7 KiB
C
144 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2013
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* Andre Przywara, Linaro <andre.przywara@linaro.org>
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*
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* Routines to transition ARMv7 processors from secure into non-secure state
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* and from non-secure SVC into HYP mode
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* needed to enable ARMv7 virtualization for current hypervisors
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*/
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#include <common.h>
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#include <asm/armv7.h>
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#include <asm/gic.h>
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#include <asm/io.h>
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#include <asm/secure.h>
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static unsigned int read_id_pfr1(void)
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{
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unsigned int reg;
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asm("mrc p15, 0, %0, c0, c1, 1\n" : "=r"(reg));
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return reg;
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}
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static unsigned long get_gicd_base_address(void)
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{
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#ifdef CONFIG_ARM_GIC_BASE_ADDRESS
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return CONFIG_ARM_GIC_BASE_ADDRESS + GIC_DIST_OFFSET;
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#else
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unsigned periphbase;
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/* get the GIC base address from the CBAR register */
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asm("mrc p15, 4, %0, c15, c0, 0\n" : "=r" (periphbase));
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/* the PERIPHBASE can be mapped above 4 GB (lower 8 bits used to
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* encode this). Bail out here since we cannot access this without
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* enabling paging.
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*/
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if ((periphbase & 0xff) != 0) {
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printf("nonsec: PERIPHBASE is above 4 GB, no access.\n");
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return -1;
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}
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return (periphbase & CBAR_MASK) + GIC_DIST_OFFSET;
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#endif
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}
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/* Define a specific version of this function to enable any available
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* hardware protections for the reserved region */
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void __weak protect_secure_section(void) {}
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static void relocate_secure_section(void)
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{
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#ifdef CONFIG_ARMV7_SECURE_BASE
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size_t sz = __secure_end - __secure_start;
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unsigned long szflush = ALIGN(sz + 1, CONFIG_SYS_CACHELINE_SIZE);
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memcpy((void *)CONFIG_ARMV7_SECURE_BASE, __secure_start, sz);
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flush_dcache_range(CONFIG_ARMV7_SECURE_BASE,
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CONFIG_ARMV7_SECURE_BASE + szflush);
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protect_secure_section();
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invalidate_icache_all();
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#endif
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}
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static void kick_secondary_cpus_gic(unsigned long gicdaddr)
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{
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/* kick all CPUs (except this one) by writing to GICD_SGIR */
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writel(1U << 24, gicdaddr + GICD_SGIR);
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}
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void __weak smp_kick_all_cpus(void)
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{
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unsigned long gic_dist_addr;
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gic_dist_addr = get_gicd_base_address();
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if (gic_dist_addr == -1)
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return;
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kick_secondary_cpus_gic(gic_dist_addr);
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}
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__weak void psci_board_init(void)
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{
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}
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int armv7_init_nonsec(void)
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{
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unsigned int reg;
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unsigned itlinesnr, i;
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unsigned long gic_dist_addr;
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/* check whether the CPU supports the security extensions */
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reg = read_id_pfr1();
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if ((reg & 0xF0) == 0) {
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printf("nonsec: Security extensions not implemented.\n");
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return -1;
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}
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/* the SCR register will be set directly in the monitor mode handler,
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* according to the spec one should not tinker with it in secure state
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* in SVC mode. Do not try to read it once in non-secure state,
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* any access to it will trap.
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*/
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gic_dist_addr = get_gicd_base_address();
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if (gic_dist_addr == -1)
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return -1;
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/* enable the GIC distributor */
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writel(readl(gic_dist_addr + GICD_CTLR) | 0x03,
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gic_dist_addr + GICD_CTLR);
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/* TYPER[4:0] contains an encoded number of available interrupts */
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itlinesnr = readl(gic_dist_addr + GICD_TYPER) & 0x1f;
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/* set all bits in the GIC group registers to one to allow access
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* from non-secure state. The first 32 interrupts are private per
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* CPU and will be set later when enabling the GIC for each core
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*/
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for (i = 1; i <= itlinesnr; i++)
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writel((unsigned)-1, gic_dist_addr + GICD_IGROUPRn + 4 * i);
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psci_board_init();
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/*
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* Relocate secure section before any cpu runs in secure ram.
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* smp_kick_all_cpus may enable other cores and runs into secure
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* ram, so need to relocate secure section before enabling other
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* cores.
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*/
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relocate_secure_section();
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#ifndef CONFIG_ARMV7_PSCI
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smp_set_core_boot_addr((unsigned long)secure_ram_addr(_smp_pen), -1);
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smp_kick_all_cpus();
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#endif
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/* call the non-sec switching code on this CPU also */
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secure_ram_addr(_nonsec_init)();
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return 0;
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}
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