qemu_bl31_setup.c

/*
 * Copyright (c) 2015-2016, ARM Limited and Contributors. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <assert.h>
#include <bl_common.h>
#include <console.h>
#include <gicv2.h>
#include <platform_def.h>
#include "qemu_private.h"

/*
 * The next 3 constants identify the extents of the code, RO data region and the
 * limit of the BL3-1 image.  These addresses are used by the MMU setup code and
 * therefore they must be page-aligned.  It is the responsibility of the linker
 * script to ensure that __RO_START__, __RO_END__ & __BL31_END__ linker symbols
 * refer to page-aligned addresses.
 */
#define BL31_RO_BASE (unsigned long)(&__RO_START__)
#define BL31_RO_LIMIT (unsigned long)(&__RO_END__)
#define BL31_END (unsigned long)(&__BL31_END__)

/*
 * Placeholder variables for copying the arguments that have been passed to
 * BL3-1 from BL2.
 */
static entry_point_info_t bl32_image_ep_info;
static entry_point_info_t bl33_image_ep_info;

/*******************************************************************************
 * Perform any BL3-1 early platform setup.  Here is an opportunity to copy
 * parameters passed by the calling EL (S-EL1 in BL2 & S-EL3 in BL1) before
 * they are lost (potentially). This needs to be done before the MMU is
 * initialized so that the memory layout can be used while creating page
 * tables. BL2 has flushed this information to memory, so we are guaranteed
 * to pick up good data.
 ******************************************************************************/
#if LOAD_IMAGE_V2
void bl31_early_platform_setup(void *from_bl2,
			       void *plat_params_from_bl2)
#else
void bl31_early_platform_setup(bl31_params_t *from_bl2,
				void *plat_params_from_bl2)
#endif
{
	/* Initialize the console to provide early debug support */
	console_init(PLAT_QEMU_BOOT_UART_BASE, PLAT_QEMU_BOOT_UART_CLK_IN_HZ,
			PLAT_QEMU_CONSOLE_BAUDRATE);

#if LOAD_IMAGE_V2
	/*
	 * Check params passed from BL2
	 */
	bl_params_t *params_from_bl2 = (bl_params_t *)from_bl2;

	assert(params_from_bl2);
	assert(params_from_bl2->h.type == PARAM_BL_PARAMS);
	assert(params_from_bl2->h.version >= VERSION_2);

	bl_params_node_t *bl_params = params_from_bl2->head;

	/*
	 * Copy BL33 and BL32 (if present), entry point information.
	 * They are stored in Secure RAM, in BL2's address space.
	 */
	while (bl_params) {
		if (bl_params->image_id == BL32_IMAGE_ID)
			bl32_image_ep_info = *bl_params->ep_info;

		if (bl_params->image_id == BL33_IMAGE_ID)
			bl33_image_ep_info = *bl_params->ep_info;

		bl_params = bl_params->next_params_info;
	}

	if (!bl33_image_ep_info.pc)
		panic();

#else /* LOAD_IMAGE_V2 */

	/*
	 * Check params passed from BL2 should not be NULL,
	 */
	assert(from_bl2 != NULL);
	assert(from_bl2->h.type == PARAM_BL31);
	assert(from_bl2->h.version >= VERSION_1);
	/*
	 * In debug builds, we pass a special value in 'plat_params_from_bl2'
	 * to verify platform parameters from BL2 to BL3-1.
	 * In release builds, it's not used.
	 */
	assert(((unsigned long long)plat_params_from_bl2) ==
		QEMU_BL31_PLAT_PARAM_VAL);

	/*
	 * Copy BL3-2 (if populated by BL2) and BL3-3 entry point information.
	 * They are stored in Secure RAM, in BL2's address space.
	 */
	if (from_bl2->bl32_ep_info)
		bl32_image_ep_info = *from_bl2->bl32_ep_info;
	bl33_image_ep_info = *from_bl2->bl33_ep_info;

#endif /* !LOAD_IMAGE_V2 */
}

void bl31_plat_arch_setup(void)
{
	qemu_configure_mmu_el3(BL31_RO_BASE, (BL31_END - BL31_RO_BASE),
			      BL31_RO_BASE, BL31_RO_LIMIT,
			      BL_COHERENT_RAM_BASE, BL_COHERENT_RAM_END);
}

static const unsigned int irq_sec_array[] = {
	QEMU_IRQ_SEC_SGI_0,
	QEMU_IRQ_SEC_SGI_1,
	QEMU_IRQ_SEC_SGI_2,
	QEMU_IRQ_SEC_SGI_3,
	QEMU_IRQ_SEC_SGI_4,
	QEMU_IRQ_SEC_SGI_5,
	QEMU_IRQ_SEC_SGI_6,
	QEMU_IRQ_SEC_SGI_7,
};

static const struct gicv2_driver_data plat_gicv2_driver_data = {
	.gicd_base = GICD_BASE,
	.gicc_base = GICC_BASE,
	.g0_interrupt_num = ARRAY_SIZE(irq_sec_array),
	.g0_interrupt_array = irq_sec_array,
};

void bl31_platform_setup(void)
{
	/* Initialize the gic cpu and distributor interfaces */
	gicv2_driver_init(&plat_gicv2_driver_data);
	gicv2_distif_init();
	gicv2_pcpu_distif_init();
	gicv2_cpuif_enable();
}

unsigned int plat_get_syscnt_freq2(void)
{
	return SYS_COUNTER_FREQ_IN_TICKS;
}

/*******************************************************************************
 * Return a pointer to the 'entry_point_info' structure of the next image
 * for the security state specified. BL3-3 corresponds to the non-secure
 * image type while BL3-2 corresponds to the secure image type. A NULL
 * pointer is returned if the image does not exist.
 ******************************************************************************/
entry_point_info_t *bl31_plat_get_next_image_ep_info(uint32_t type)
{
	entry_point_info_t *next_image_info;

	assert(sec_state_is_valid(type));
	next_image_info = (type == NON_SECURE)
			? &bl33_image_ep_info : &bl32_image_ep_info;
	/*
	 * None of the images on the ARM development platforms can have 0x0
	 * as the entrypoint
	 */
	if (next_image_info->pc)
		return next_image_info;
	else
		return NULL;
}