arch/sandbox/cpu/cpu.c - u-boot - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright (c) 2011 The Chromium OS Authors.
  */

 #include <common.h>
 #include <dm.h>
 #include <errno.h>
 #include <linux/libfdt.h>
 #include <os.h>
 #include <asm/io.h>
 #include <asm/setjmp.h>
 #include <asm/state.h>
 #include <dm/root.h>

 DECLARE_GLOBAL_DATA_PTR;

 /* Enable access to PCI memory with map_sysmem() */
 static bool enable_pci_map;

 #ifdef CONFIG_PCI
 /* Last device that was mapped into memory, and length of mapping */
 static struct udevice *map_dev;
 unsigned long map_len;
 #endif

 void sandbox_exit(void)
 {
 	/* Do this here while it still has an effect */
 	os_fd_restore();
 	if (state_uninit())
 		os_exit(2);

 	if (dm_uninit())
 		os_exit(2);

 	/* This is considered normal termination for now */
 	os_exit(0);
 }

 /* delay x useconds */
 void __udelay(unsigned long usec)
 {
 	struct sandbox_state *state = state_get_current();

 	if (!state->skip_delays)
 		os_usleep(usec);
 }

 int cleanup_before_linux(void)
 {
 	return 0;
 }

 int cleanup_before_linux_select(int flags)
 {
 	return 0;
 }

 /**
  * is_in_sandbox_mem() - Checks if a pointer is within sandbox's emulated DRAM
  *
  * This provides a way to check if a pointer is owned by sandbox (and is within
  * its RAM) or not. Sometimes pointers come from a test which conceptually runs
  * output sandbox, potentially with direct access to the C-library malloc()
  * function, or the sandbox stack (which is not actually within the emulated
  * DRAM.
  *
  * Such pointers obviously cannot be mapped into sandbox's DRAM, so we must
  * detect them an process them separately, by recording a mapping to a tag,
  * which we can use to map back to the pointer later.
  *
  * @ptr: Pointer to check
  * @return true if this is within sandbox emulated DRAM, false if not
  */
 static bool is_in_sandbox_mem(const void *ptr)
 {
 	return (const uint8_t *)ptr >= gd->arch.ram_buf &&
 		(const uint8_t *)ptr < gd->arch.ram_buf + gd->ram_size;
 }

 /**
  * phys_to_virt() - Converts a sandbox RAM address to a pointer
  *
  * Sandbox uses U-Boot addresses from 0 to the size of DRAM. These index into
  * the emulated DRAM buffer used by sandbox. This function converts such an
  * address to a pointer into this buffer, which can be used to access the
  * memory.
  *
  * If the address is outside this range, it is assumed to be a tag
  */
 void *phys_to_virt(phys_addr_t paddr)
 {
 	struct sandbox_mapmem_entry *mentry;
 	struct sandbox_state *state;

 	/* If the address is within emulated DRAM, calculate the value */
 	if (paddr < gd->ram_size)
 		return (void *)(gd->arch.ram_buf + paddr);

 	/*
 	 * Otherwise search out list of tags for the correct pointer previously
 	 * created by map_to_sysmem()
 	 */
 	state = state_get_current();
 	list_for_each_entry(mentry, &state->mapmem_head, sibling_node) {
 		if (mentry->tag == paddr) {
 			debug("%s: Used map from %lx to %p\n", __func__,
 			      (ulong)paddr, mentry->ptr);
 			return mentry->ptr;
 		}
 	}

 	printf("%s: Cannot map sandbox address %lx (SDRAM from 0 to %lx)\n",
 	       __func__, (ulong)paddr, (ulong)gd->ram_size);
 	os_abort();

 	/* Not reached */
 	return NULL;
 }

 struct sandbox_mapmem_entry *find_tag(const void *ptr)
 {
 	struct sandbox_mapmem_entry *mentry;
 	struct sandbox_state *state = state_get_current();

 	list_for_each_entry(mentry, &state->mapmem_head, sibling_node) {
 		if (mentry->ptr == ptr) {
 			debug("%s: Used map from %p to %lx\n", __func__, ptr,
 			      mentry->tag);
 			return mentry;
 		}
 	}
 	return NULL;
 }

 phys_addr_t virt_to_phys(void *ptr)
 {
 	struct sandbox_mapmem_entry *mentry;

 	/*
 	 * If it is in emulated RAM, don't bother looking for a tag. Just
 	 * calculate the pointer using the provides offset into the RAM buffer.
 	 */
 	if (is_in_sandbox_mem(ptr))
 		return (phys_addr_t)((uint8_t *)ptr - gd->arch.ram_buf);

 	mentry = find_tag(ptr);
 	if (!mentry) {
 		/* Abort so that gdb can be used here */
 		printf("%s: Cannot map sandbox address %p (SDRAM from 0 to %lx)\n",
 		       __func__, ptr, (ulong)gd->ram_size);
 		os_abort();
 	}
 	debug("%s: Used map from %p to %lx\n", __func__, ptr, mentry->tag);

 	return mentry->tag;
 }

 void *map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags)
 {
 #if defined(CONFIG_PCI) && !defined(CONFIG_SPL_BUILD)
 	unsigned long plen = len;
 	void *ptr;

 	map_dev = NULL;
 	if (enable_pci_map && !pci_map_physmem(paddr, &len, &map_dev, &ptr)) {
 		if (plen != len) {
 			printf("%s: Warning: partial map at %x, wanted %lx, got %lx\n",
 			       __func__, (uint)paddr, len, plen);
 		}
 		map_len = len;
 		return ptr;
 	}
 #endif

 	return phys_to_virt(paddr);
 }

 void unmap_physmem(const void *ptr, unsigned long flags)
 {
 #ifdef CONFIG_PCI
 	if (map_dev) {
 		pci_unmap_physmem(ptr, map_len, map_dev);
 		map_dev = NULL;
 	}
 #endif
 }

 phys_addr_t map_to_sysmem(const void *ptr)
 {
 	struct sandbox_mapmem_entry *mentry;

 	/*
 	 * If it is in emulated RAM, don't bother creating a tag. Just return
 	 * the offset into the RAM buffer.
 	 */
 	if (is_in_sandbox_mem(ptr))
 		return (u8 *)ptr - gd->arch.ram_buf;

 	/*
 	 * See if there is an existing tag with this pointer. If not, set up a
 	 * new one.
 	 */
 	mentry = find_tag(ptr);
 	if (!mentry) {
 		struct sandbox_state *state = state_get_current();

 		mentry = malloc(sizeof(*mentry));
 		if (!mentry) {
 			printf("%s: Error: Out of memory\n", __func__);
 			os_exit(ENOMEM);
 		}
 		mentry->tag = state->next_tag++;
 		mentry->ptr = (void *)ptr;
 		list_add_tail(&mentry->sibling_node, &state->mapmem_head);
 		debug("%s: Added map from %p to %lx\n", __func__, ptr,
 		      (ulong)mentry->tag);
 	}

 	/*
 	 * Return the tag as the address to use. A later call to map_sysmem()
 	 * will return ptr
 	 */
 	return mentry->tag;
 }

 void sandbox_set_enable_pci_map(int enable)
 {
 	enable_pci_map = enable;
 }

 void flush_dcache_range(unsigned long start, unsigned long stop)
 {
 }

 void invalidate_dcache_range(unsigned long start, unsigned long stop)
 {
 }

 int sandbox_read_fdt_from_file(void)
 {
 	struct sandbox_state *state = state_get_current();
 	const char *fname = state->fdt_fname;
 	void *blob;
 	loff_t size;
 	int err;
 	int fd;

 	blob = map_sysmem(CONFIG_SYS_FDT_LOAD_ADDR, 0);
 	if (!state->fdt_fname) {
 		err = fdt_create_empty_tree(blob, 256);
 		if (!err)
 			goto done;
 		printf("Unable to create empty FDT: %s\n", fdt_strerror(err));
 		return -EINVAL;
 	}

 	err = os_get_filesize(fname, &size);
 	if (err < 0) {
 		printf("Failed to file FDT file '%s'\n", fname);
 		return err;
 	}
 	fd = os_open(fname, OS_O_RDONLY);
 	if (fd < 0) {
 		printf("Failed to open FDT file '%s'\n", fname);
 		return -EACCES;
 	}
 	if (os_read(fd, blob, size) != size) {
 		os_close(fd);
 		return -EIO;
 	}
 	os_close(fd);

 done:
 	gd->fdt_blob = blob;

 	return 0;
 }

 ulong timer_get_boot_us(void)
 {
 	static uint64_t base_count;
 	uint64_t count = os_get_nsec();

 	if (!base_count)
 		base_count = count;

 	return (count - base_count) / 1000;
 }
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Copyright (c) 2011 The Chromium OS Authors.
	*/

	#include <common.h>
	#include <dm.h>
	#include <errno.h>
	#include <linux/libfdt.h>
	#include <os.h>
	#include <asm/io.h>
	#include <asm/setjmp.h>
	#include <asm/state.h>
	#include <dm/root.h>

	DECLARE_GLOBAL_DATA_PTR;

	/* Enable access to PCI memory with map_sysmem() */
	static bool enable_pci_map;

	#ifdef CONFIG_PCI
	/* Last device that was mapped into memory, and length of mapping */
	static struct udevice *map_dev;
	unsigned long map_len;
	#endif

	void sandbox_exit(void)
	{
	/* Do this here while it still has an effect */
	os_fd_restore();
	if (state_uninit())
	os_exit(2);

	if (dm_uninit())
	os_exit(2);

	/* This is considered normal termination for now */
	os_exit(0);
	}

	/* delay x useconds */
	void __udelay(unsigned long usec)
	{
	struct sandbox_state *state = state_get_current();

	if (!state->skip_delays)
	os_usleep(usec);
	}

	int cleanup_before_linux(void)
	{
	return 0;
	}

	int cleanup_before_linux_select(int flags)
	{
	return 0;
	}

	/**
	* is_in_sandbox_mem() - Checks if a pointer is within sandbox's emulated DRAM
	*
	* This provides a way to check if a pointer is owned by sandbox (and is within
	* its RAM) or not. Sometimes pointers come from a test which conceptually runs
	* output sandbox, potentially with direct access to the C-library malloc()
	* function, or the sandbox stack (which is not actually within the emulated
	* DRAM.
	*
	* Such pointers obviously cannot be mapped into sandbox's DRAM, so we must
	* detect them an process them separately, by recording a mapping to a tag,
	* which we can use to map back to the pointer later.
	*
	* @ptr: Pointer to check
	* @return true if this is within sandbox emulated DRAM, false if not
	*/
	static bool is_in_sandbox_mem(const void *ptr)
	{
	return (const uint8_t *)ptr >= gd->arch.ram_buf &&
	(const uint8_t *)ptr < gd->arch.ram_buf + gd->ram_size;
	}

	/**
	* phys_to_virt() - Converts a sandbox RAM address to a pointer
	*
	* Sandbox uses U-Boot addresses from 0 to the size of DRAM. These index into
	* the emulated DRAM buffer used by sandbox. This function converts such an
	* address to a pointer into this buffer, which can be used to access the
	* memory.
	*
	* If the address is outside this range, it is assumed to be a tag
	*/
	void *phys_to_virt(phys_addr_t paddr)
	{
	struct sandbox_mapmem_entry *mentry;
	struct sandbox_state *state;

	/* If the address is within emulated DRAM, calculate the value */
	if (paddr < gd->ram_size)
	return (void *)(gd->arch.ram_buf + paddr);

	/*
	* Otherwise search out list of tags for the correct pointer previously
	* created by map_to_sysmem()
	*/
	state = state_get_current();
	list_for_each_entry(mentry, &state->mapmem_head, sibling_node) {
	if (mentry->tag == paddr) {
	debug("%s: Used map from %lx to %p\n", __func__,
	(ulong)paddr, mentry->ptr);
	return mentry->ptr;
	}
	}

	printf("%s: Cannot map sandbox address %lx (SDRAM from 0 to %lx)\n",
	__func__, (ulong)paddr, (ulong)gd->ram_size);
	os_abort();

	/* Not reached */
	return NULL;
	}

	struct sandbox_mapmem_entry find_tag(const void ptr)
	{
	struct sandbox_mapmem_entry *mentry;
	struct sandbox_state *state = state_get_current();

	list_for_each_entry(mentry, &state->mapmem_head, sibling_node) {
	if (mentry->ptr == ptr) {
	debug("%s: Used map from %p to %lx\n", __func__, ptr,
	mentry->tag);
	return mentry;
	}
	}
	return NULL;
	}

	phys_addr_t virt_to_phys(void *ptr)
	{
	struct sandbox_mapmem_entry *mentry;

	/*
	* If it is in emulated RAM, don't bother looking for a tag. Just
	* calculate the pointer using the provides offset into the RAM buffer.
	*/
	if (is_in_sandbox_mem(ptr))
	return (phys_addr_t)((uint8_t *)ptr - gd->arch.ram_buf);

	mentry = find_tag(ptr);
	if (!mentry) {
	/* Abort so that gdb can be used here */
	printf("%s: Cannot map sandbox address %p (SDRAM from 0 to %lx)\n",
	__func__, ptr, (ulong)gd->ram_size);
	os_abort();
	}
	debug("%s: Used map from %p to %lx\n", __func__, ptr, mentry->tag);

	return mentry->tag;
	}

	void *map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags)
	{
	#if defined(CONFIG_PCI) && !defined(CONFIG_SPL_BUILD)
	unsigned long plen = len;
	void *ptr;

	map_dev = NULL;
	if (enable_pci_map && !pci_map_physmem(paddr, &len, &map_dev, &ptr)) {
	if (plen != len) {
	printf("%s: Warning: partial map at %x, wanted %lx, got %lx\n",
	__func__, (uint)paddr, len, plen);
	}
	map_len = len;
	return ptr;
	}
	#endif

	return phys_to_virt(paddr);
	}

	void unmap_physmem(const void *ptr, unsigned long flags)
	{
	#ifdef CONFIG_PCI
	if (map_dev) {
	pci_unmap_physmem(ptr, map_len, map_dev);
	map_dev = NULL;
	}
	#endif
	}

	phys_addr_t map_to_sysmem(const void *ptr)
	{
	struct sandbox_mapmem_entry *mentry;

	/*
	* If it is in emulated RAM, don't bother creating a tag. Just return
	* the offset into the RAM buffer.
	*/
	if (is_in_sandbox_mem(ptr))
	return (u8 *)ptr - gd->arch.ram_buf;

	/*
	* See if there is an existing tag with this pointer. If not, set up a
	* new one.
	*/
	mentry = find_tag(ptr);
	if (!mentry) {
	struct sandbox_state *state = state_get_current();

	mentry = malloc(sizeof(*mentry));
	if (!mentry) {
	printf("%s: Error: Out of memory\n", __func__);
	os_exit(ENOMEM);
	}
	mentry->tag = state->next_tag++;
	mentry->ptr = (void *)ptr;
	list_add_tail(&mentry->sibling_node, &state->mapmem_head);
	debug("%s: Added map from %p to %lx\n", __func__, ptr,
	(ulong)mentry->tag);
	}

	/*
	* Return the tag as the address to use. A later call to map_sysmem()
	* will return ptr
	*/
	return mentry->tag;
	}

	void sandbox_set_enable_pci_map(int enable)
	{
	enable_pci_map = enable;
	}

	void flush_dcache_range(unsigned long start, unsigned long stop)
	{
	}

	void invalidate_dcache_range(unsigned long start, unsigned long stop)
	{
	}

	int sandbox_read_fdt_from_file(void)
	{
	struct sandbox_state *state = state_get_current();
	const char *fname = state->fdt_fname;
	void *blob;
	loff_t size;
	int err;
	int fd;

	blob = map_sysmem(CONFIG_SYS_FDT_LOAD_ADDR, 0);
	if (!state->fdt_fname) {
	err = fdt_create_empty_tree(blob, 256);
	if (!err)
	goto done;
	printf("Unable to create empty FDT: %s\n", fdt_strerror(err));
	return -EINVAL;
	}

	err = os_get_filesize(fname, &size);
	if (err < 0) {
	printf("Failed to file FDT file '%s'\n", fname);
	return err;
	}
	fd = os_open(fname, OS_O_RDONLY);
	if (fd < 0) {
	printf("Failed to open FDT file '%s'\n", fname);
	return -EACCES;
	}
	if (os_read(fd, blob, size) != size) {
	os_close(fd);
	return -EIO;
	}
	os_close(fd);

	done:
	gd->fdt_blob = blob;

	return 0;
	}

	ulong timer_get_boot_us(void)
	{
	static uint64_t base_count;
	uint64_t count = os_get_nsec();

	if (!base_count)
	base_count = count;

	return (count - base_count) / 1000;
	}