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 <gic_common.h>
#include <gicv2.h>
#include <platform_def.h>
#include <platform.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_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.
 ******************************************************************************/
void bl31_early_platform_setup(void *from_bl2,
			       void *plat_params_from_bl2)
{
	/* Initialize the console to provide early debug support */
	qemu_console_init();

	/*
	 * 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();
}

void bl31_plat_arch_setup(void)
{
	qemu_configure_mmu_el3(BL31_BASE, (BL31_END - BL31_BASE),
			      BL_CODE_BASE, BL_CODE_END,
			      BL_RO_DATA_BASE, BL_RO_DATA_END,
			      BL_COHERENT_RAM_BASE, BL_COHERENT_RAM_END);
}

/******************************************************************************
 * On a GICv2 system, the Group 1 secure interrupts are treated as Group 0
 * interrupts.
 *****************************************************************************/
#define PLATFORM_G1S_PROPS(grp)						\
	INTR_PROP_DESC(QEMU_IRQ_SEC_SGI_0, GIC_HIGHEST_SEC_PRIORITY,	\
					   grp, GIC_INTR_CFG_EDGE),	\
	INTR_PROP_DESC(QEMU_IRQ_SEC_SGI_1, GIC_HIGHEST_SEC_PRIORITY,	\
					   grp, GIC_INTR_CFG_EDGE),	\
	INTR_PROP_DESC(QEMU_IRQ_SEC_SGI_2, GIC_HIGHEST_SEC_PRIORITY,	\
					   grp, GIC_INTR_CFG_EDGE),	\
	INTR_PROP_DESC(QEMU_IRQ_SEC_SGI_3, GIC_HIGHEST_SEC_PRIORITY,	\
					   grp, GIC_INTR_CFG_EDGE),	\
	INTR_PROP_DESC(QEMU_IRQ_SEC_SGI_4, GIC_HIGHEST_SEC_PRIORITY,	\
					   grp, GIC_INTR_CFG_EDGE),	\
	INTR_PROP_DESC(QEMU_IRQ_SEC_SGI_5, GIC_HIGHEST_SEC_PRIORITY,	\
					   grp, GIC_INTR_CFG_EDGE),	\
	INTR_PROP_DESC(QEMU_IRQ_SEC_SGI_6, GIC_HIGHEST_SEC_PRIORITY,	\
					   grp, GIC_INTR_CFG_EDGE),	\
	INTR_PROP_DESC(QEMU_IRQ_SEC_SGI_7, GIC_HIGHEST_SEC_PRIORITY,	\
					   grp, GIC_INTR_CFG_EDGE)

#define PLATFORM_G0_PROPS(grp)

static const interrupt_prop_t qemu_interrupt_props[] = {
	PLATFORM_G1S_PROPS(GICV2_INTR_GROUP0),
	PLATFORM_G0_PROPS(GICV2_INTR_GROUP0)
};

static const struct gicv2_driver_data plat_gicv2_driver_data = {
	.gicd_base = GICD_BASE,
	.gicc_base = GICC_BASE,
	.interrupt_props = qemu_interrupt_props,
	.interrupt_props_num = ARRAY_SIZE(qemu_interrupt_props),
};

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;
}