290 lines
6.7 KiB
C
290 lines
6.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2011 The Chromium OS Authors.
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*/
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <linux/libfdt.h>
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#include <os.h>
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#include <asm/io.h>
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#include <asm/setjmp.h>
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#include <asm/state.h>
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#include <dm/root.h>
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DECLARE_GLOBAL_DATA_PTR;
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/* Enable access to PCI memory with map_sysmem() */
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static bool enable_pci_map;
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#ifdef CONFIG_PCI
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/* Last device that was mapped into memory, and length of mapping */
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static struct udevice *map_dev;
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unsigned long map_len;
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#endif
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void sandbox_exit(void)
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{
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/* Do this here while it still has an effect */
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os_fd_restore();
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if (state_uninit())
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os_exit(2);
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if (dm_uninit())
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os_exit(2);
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/* This is considered normal termination for now */
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os_exit(0);
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}
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/* delay x useconds */
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void __udelay(unsigned long usec)
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{
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struct sandbox_state *state = state_get_current();
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if (!state->skip_delays)
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os_usleep(usec);
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}
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int cleanup_before_linux(void)
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{
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return 0;
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}
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int cleanup_before_linux_select(int flags)
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{
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return 0;
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}
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/**
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* is_in_sandbox_mem() - Checks if a pointer is within sandbox's emulated DRAM
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*
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* This provides a way to check if a pointer is owned by sandbox (and is within
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* its RAM) or not. Sometimes pointers come from a test which conceptually runs
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* output sandbox, potentially with direct access to the C-library malloc()
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* function, or the sandbox stack (which is not actually within the emulated
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* DRAM.
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*
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* Such pointers obviously cannot be mapped into sandbox's DRAM, so we must
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* detect them an process them separately, by recording a mapping to a tag,
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* which we can use to map back to the pointer later.
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*
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* @ptr: Pointer to check
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* @return true if this is within sandbox emulated DRAM, false if not
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*/
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static bool is_in_sandbox_mem(const void *ptr)
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{
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return (const uint8_t *)ptr >= gd->arch.ram_buf &&
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(const uint8_t *)ptr < gd->arch.ram_buf + gd->ram_size;
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}
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/**
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* phys_to_virt() - Converts a sandbox RAM address to a pointer
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*
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* Sandbox uses U-Boot addresses from 0 to the size of DRAM. These index into
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* the emulated DRAM buffer used by sandbox. This function converts such an
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* address to a pointer into this buffer, which can be used to access the
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* memory.
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*
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* If the address is outside this range, it is assumed to be a tag
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*/
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void *phys_to_virt(phys_addr_t paddr)
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{
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struct sandbox_mapmem_entry *mentry;
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struct sandbox_state *state;
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/* If the address is within emulated DRAM, calculate the value */
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if (paddr < gd->ram_size)
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return (void *)(gd->arch.ram_buf + paddr);
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/*
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* Otherwise search out list of tags for the correct pointer previously
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* created by map_to_sysmem()
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*/
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state = state_get_current();
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list_for_each_entry(mentry, &state->mapmem_head, sibling_node) {
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if (mentry->tag == paddr) {
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debug("%s: Used map from %lx to %p\n", __func__,
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(ulong)paddr, mentry->ptr);
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return mentry->ptr;
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}
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}
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printf("%s: Cannot map sandbox address %lx (SDRAM from 0 to %lx)\n",
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__func__, (ulong)paddr, (ulong)gd->ram_size);
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os_abort();
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/* Not reached */
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return NULL;
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}
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struct sandbox_mapmem_entry *find_tag(const void *ptr)
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{
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struct sandbox_mapmem_entry *mentry;
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struct sandbox_state *state = state_get_current();
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list_for_each_entry(mentry, &state->mapmem_head, sibling_node) {
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if (mentry->ptr == ptr) {
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debug("%s: Used map from %p to %lx\n", __func__, ptr,
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mentry->tag);
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return mentry;
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}
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}
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return NULL;
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}
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phys_addr_t virt_to_phys(void *ptr)
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{
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struct sandbox_mapmem_entry *mentry;
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/*
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* If it is in emulated RAM, don't bother looking for a tag. Just
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* calculate the pointer using the provides offset into the RAM buffer.
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*/
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if (is_in_sandbox_mem(ptr))
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return (phys_addr_t)((uint8_t *)ptr - gd->arch.ram_buf);
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mentry = find_tag(ptr);
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if (!mentry) {
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/* Abort so that gdb can be used here */
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printf("%s: Cannot map sandbox address %p (SDRAM from 0 to %lx)\n",
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__func__, ptr, (ulong)gd->ram_size);
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os_abort();
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}
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debug("%s: Used map from %p to %lx\n", __func__, ptr, mentry->tag);
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return mentry->tag;
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}
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void *map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags)
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{
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#if defined(CONFIG_PCI) && !defined(CONFIG_SPL_BUILD)
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unsigned long plen = len;
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void *ptr;
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map_dev = NULL;
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if (enable_pci_map && !pci_map_physmem(paddr, &len, &map_dev, &ptr)) {
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if (plen != len) {
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printf("%s: Warning: partial map at %x, wanted %lx, got %lx\n",
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__func__, (uint)paddr, len, plen);
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}
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map_len = len;
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return ptr;
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}
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#endif
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return phys_to_virt(paddr);
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}
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void unmap_physmem(const void *ptr, unsigned long flags)
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{
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#ifdef CONFIG_PCI
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if (map_dev) {
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pci_unmap_physmem(ptr, map_len, map_dev);
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map_dev = NULL;
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}
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#endif
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}
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phys_addr_t map_to_sysmem(const void *ptr)
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{
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struct sandbox_mapmem_entry *mentry;
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/*
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* If it is in emulated RAM, don't bother creating a tag. Just return
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* the offset into the RAM buffer.
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*/
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if (is_in_sandbox_mem(ptr))
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return (u8 *)ptr - gd->arch.ram_buf;
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/*
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* See if there is an existing tag with this pointer. If not, set up a
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* new one.
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*/
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mentry = find_tag(ptr);
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if (!mentry) {
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struct sandbox_state *state = state_get_current();
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mentry = malloc(sizeof(*mentry));
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if (!mentry) {
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printf("%s: Error: Out of memory\n", __func__);
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os_exit(ENOMEM);
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}
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mentry->tag = state->next_tag++;
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mentry->ptr = (void *)ptr;
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list_add_tail(&mentry->sibling_node, &state->mapmem_head);
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debug("%s: Added map from %p to %lx\n", __func__, ptr,
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(ulong)mentry->tag);
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}
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/*
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* Return the tag as the address to use. A later call to map_sysmem()
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* will return ptr
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*/
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return mentry->tag;
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}
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void sandbox_set_enable_pci_map(int enable)
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{
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enable_pci_map = enable;
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}
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void flush_dcache_range(unsigned long start, unsigned long stop)
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{
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}
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void invalidate_dcache_range(unsigned long start, unsigned long stop)
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{
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}
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int sandbox_read_fdt_from_file(void)
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{
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struct sandbox_state *state = state_get_current();
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const char *fname = state->fdt_fname;
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void *blob;
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loff_t size;
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int err;
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int fd;
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blob = map_sysmem(CONFIG_SYS_FDT_LOAD_ADDR, 0);
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if (!state->fdt_fname) {
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err = fdt_create_empty_tree(blob, 256);
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if (!err)
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goto done;
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printf("Unable to create empty FDT: %s\n", fdt_strerror(err));
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return -EINVAL;
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}
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err = os_get_filesize(fname, &size);
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if (err < 0) {
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printf("Failed to file FDT file '%s'\n", fname);
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return err;
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}
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fd = os_open(fname, OS_O_RDONLY);
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if (fd < 0) {
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printf("Failed to open FDT file '%s'\n", fname);
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return -EACCES;
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}
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if (os_read(fd, blob, size) != size) {
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os_close(fd);
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return -EIO;
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}
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os_close(fd);
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done:
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gd->fdt_blob = blob;
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return 0;
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}
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ulong timer_get_boot_us(void)
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{
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static uint64_t base_count;
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uint64_t count = os_get_nsec();
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if (!base_count)
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base_count = count;
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return (count - base_count) / 1000;
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}
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