[coreboot-gerrit] New patch to review for coreboot: 559cd29 libpayload arm64: Add support for mmu
Patrick Georgi (pgeorgi@google.com)
gerrit at coreboot.org
Fri Mar 20 10:33:57 CET 2015
Patrick Georgi (pgeorgi at google.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/8791
-gerrit
commit 559cd291faa7444906f52ead672b27fb86c31833
Author: Furquan Shaikh <furquan at google.com>
Date: Thu Sep 4 15:32:17 2014 -0700
libpayload arm64: Add support for mmu
Adds support for initializing mmu, setting up dma areas and enabling mmu based
on the memranges passed on in the coreboot tables.
CQ-DEPEND=CL:216826
BUG=chrome-os-partner:31634
BRANCH=None
TEST=Compiles successfully
Change-Id: Id41a4255f1cd45a9455840f1eaa53503bd6fef3f
Signed-off-by: Patrick Georgi <pgeorgi at chromium.org>
Original-Commit-Id: f2c6676bf51fcd85b61e9e08a261634a78137c4c
Original-Change-Id: I217bc5a5aff6a1fc0809c769822d820316d5c434
Original-Signed-off-by: Furquan Shaikh <furquan at google.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/216823
Original-Reviewed-by: Aaron Durbin <adurbin at chromium.org>
Original-Tested-by: Furquan Shaikh <furquan at chromium.org>
Original-Commit-Queue: Furquan Shaikh <furquan at chromium.org>
---
payloads/libpayload/arch/arm64/Makefile.inc | 1 +
payloads/libpayload/arch/arm64/cache.c | 24 -
payloads/libpayload/arch/arm64/mmu.c | 618 +++++++++++++++++++++++++
payloads/libpayload/include/arm64/arch/cache.h | 3 -
payloads/libpayload/include/arm64/arch/mmu.h | 213 +++++++++
5 files changed, 832 insertions(+), 27 deletions(-)
diff --git a/payloads/libpayload/arch/arm64/Makefile.inc b/payloads/libpayload/arch/arm64/Makefile.inc
index 1c23a47..ddf0550 100644
--- a/payloads/libpayload/arch/arm64/Makefile.inc
+++ b/payloads/libpayload/arch/arm64/Makefile.inc
@@ -40,6 +40,7 @@ libc-y += memcpy.S memset.S memmove.S
libc-y += exception_asm.S exception.c
libc-y += cache.c cpu.S
libc-y += selfboot.c
+libc-y += mmu.c
libcbfs-$(CONFIG_LP_CBFS) += dummy_media.c
libgdb-y += gdb.c
diff --git a/payloads/libpayload/arch/arm64/cache.c b/payloads/libpayload/arch/arm64/cache.c
index 1a9e7a6..2ce1cc4 100644
--- a/payloads/libpayload/arch/arm64/cache.c
+++ b/payloads/libpayload/arch/arm64/cache.c
@@ -117,30 +117,6 @@ void dcache_invalidate_by_mva(void const *addr, size_t len)
dcache_op_va(addr, len, OP_DCIVAC);
}
-/*
- * CAUTION: This implementation assumes that coreboot never uses non-identity
- * page tables for pages containing executed code. If you ever want to violate
- * this assumption, have fun figuring out the associated problems on your own.
- */
-void dcache_mmu_disable(void)
-{
- uint32_t sctlr;
-
- dcache_clean_invalidate_all();
- sctlr = raw_read_sctlr_current();
- sctlr &= ~(SCTLR_C | SCTLR_M);
- raw_write_sctlr_current(sctlr);
-}
-
-void dcache_mmu_enable(void)
-{
- uint32_t sctlr;
-
- sctlr = raw_read_sctlr_current();
- sctlr |= SCTLR_C | SCTLR_M;
- raw_write_sctlr_current(sctlr);
-}
-
void cache_sync_instructions(void)
{
dcache_clean_all(); /* includes trailing DSB (in assembly) */
diff --git a/payloads/libpayload/arch/arm64/mmu.c b/payloads/libpayload/arch/arm64/mmu.c
new file mode 100644
index 0000000..85f3ac9
--- /dev/null
+++ b/payloads/libpayload/arch/arm64/mmu.c
@@ -0,0 +1,618 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2014 Google Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <assert.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+
+#include <arch/mmu.h>
+#include <arch/lib_helpers.h>
+#include <arch/cache.h>
+
+/* Maximum number of XLAT Tables available based on ttb buffer size */
+static unsigned int max_tables;
+/* Address of ttb buffer */
+static uint64_t *xlat_addr;
+
+static int free_idx;
+static uint8_t ttb_buffer[TTB_DEFAULT_SIZE] __attribute__((aligned(GRANULE_SIZE)));
+
+/*
+ * The usedmem_ranges is used to describe all the memory ranges that are
+ * actually used by payload i.e. _start -> _end in linker script and the
+ * coreboot tables. This is required for two purposes:
+ * 1) During the pre_sysinfo_scan_mmu_setup, these are the only ranges
+ * initialized in the page table as we do not know the entire memory map.
+ * 2) During the post_sysinfo_scan_mmu_setup, these ranges are used to check if
+ * the DMA buffer is being placed in a sane location and does not overlap any of
+ * the used mem ranges.
+ */
+struct mmu_ranges usedmem_ranges;
+
+static const uint64_t level_to_addr_mask[] = {
+ L1_ADDR_MASK,
+ L2_ADDR_MASK,
+ L3_ADDR_MASK,
+};
+
+static const uint64_t level_to_addr_shift[] = {
+ L1_ADDR_SHIFT,
+ L2_ADDR_SHIFT,
+ L3_ADDR_SHIFT,
+};
+
+static void __attribute__((noreturn)) mmu_error(void)
+{
+ halt();
+}
+
+/*
+ * Func : get_block_attr
+ * Desc : Get block descriptor attributes based on the value of tag in memrange
+ * region
+ */
+static uint64_t get_block_attr(unsigned long tag)
+{
+ uint64_t attr;
+
+ /* We should be in EL2(which is non-secure only) or EL1(non-secure) */
+ attr = BLOCK_NS;
+
+ /* Assuming whole memory is read-write */
+ attr |= BLOCK_AP_RW;
+
+ attr |= BLOCK_ACCESS;
+
+ switch (tag) {
+
+ case TYPE_NORMAL_MEM:
+ attr |= (BLOCK_INDEX_MEM_NORMAL << BLOCK_INDEX_SHIFT);
+ break;
+ case TYPE_DEV_MEM:
+ attr |= BLOCK_INDEX_MEM_DEV_NGNRNE << BLOCK_INDEX_SHIFT;
+ break;
+ case TYPE_DMA_MEM:
+ attr |= BLOCK_INDEX_MEM_NORMAL_NC << BLOCK_INDEX_SHIFT;
+ break;
+ }
+
+ return attr;
+}
+
+/*
+ * Func : get_index_from_addr
+ * Desc : Get index into table at a given level using appropriate bits from the
+ * base address
+ */
+static uint64_t get_index_from_addr(uint64_t addr, uint8_t level)
+{
+ uint64_t mask = level_to_addr_mask[level-1];
+ uint8_t shift = level_to_addr_shift[level-1];
+
+ return ((addr & mask) >> shift);
+}
+
+/*
+ * Func : table_desc_valid
+ * Desc : Check if a table entry contains valid desc
+ */
+static uint64_t table_desc_valid(uint64_t desc)
+{
+ return((desc & TABLE_DESC) == TABLE_DESC);
+}
+
+/*
+ * Func : get_new_table
+ * Desc : Return the next free XLAT table from ttb buffer
+ */
+static uint64_t *get_new_table(void)
+{
+ uint64_t *new;
+
+ if (free_idx >= max_tables) {
+ printf("ARM64 MMU: No free table\n");
+ return NULL;
+ }
+
+ new = (uint64_t*)((unsigned char *)xlat_addr + free_idx * GRANULE_SIZE);
+ free_idx++;
+
+ memset(new, 0, GRANULE_SIZE);
+
+ return new;
+}
+
+/*
+ * Func : get_table_from_desc
+ * Desc : Get next level table address from table descriptor
+ */
+static uint64_t *get_table_from_desc(uint64_t desc)
+{
+ uint64_t *ptr = (uint64_t*)(desc & XLAT_TABLE_MASK);
+ return ptr;
+}
+
+/*
+ * Func: get_next_level_table
+ * Desc: Check if the table entry is a valid descriptor. If not, allocate new
+ * table, update the entry and return the table addr. If valid, return the addr.
+ */
+static uint64_t *get_next_level_table(uint64_t *ptr)
+{
+ uint64_t desc = *ptr;
+
+ if (!table_desc_valid(desc)) {
+ uint64_t *new_table = get_new_table();
+ if (new_table == NULL)
+ return NULL;
+ desc = ((uint64_t)new_table) | TABLE_DESC;
+ *ptr = desc;
+ }
+ return get_table_from_desc(desc);
+}
+
+/*
+ * Func : init_xlat_table
+ * Desc : Given a base address and size, it identifies the indices within
+ * different level XLAT tables which map the given base addr. Similar to table
+ * walk, except that all invalid entries during the walk are updated
+ * accordingly. On success, it returns the size of the block/page addressed by
+ * the final table.
+ */
+static uint64_t init_xlat_table(uint64_t base_addr,
+ uint64_t size,
+ uint64_t tag)
+{
+ uint64_t l1_index = get_index_from_addr(base_addr,1);
+ uint64_t l2_index = get_index_from_addr(base_addr,2);
+ uint64_t l3_index = get_index_from_addr(base_addr,3);
+ uint64_t *table = xlat_addr;
+ uint64_t desc;
+ uint64_t attr = get_block_attr(tag);
+
+ /*
+ * L1 table lookup
+ * If VA has bits more than 41, lookup starts at L1
+ */
+ if (l1_index) {
+ table = get_next_level_table(&table[l1_index]);
+ if (!table)
+ return 0;
+ }
+
+ /*
+ * L2 table lookup
+ * If lookup was performed at L1, L2 table addr is obtained from L1 desc
+ * else, lookup starts at ttbr address
+ */
+ if (!l3_index && (size >= L2_XLAT_SIZE)) {
+ /*
+ * If block address is aligned and size is greater than or equal
+ * to 512MiB i.e. size addressed by each L2 entry, we can
+ * directly store a block desc
+ */
+ desc = base_addr | BLOCK_DESC | attr;
+ table[l2_index] = desc;
+ /* L3 lookup is not required */
+ return L2_XLAT_SIZE;
+ } else {
+ /* L2 entry stores a table descriptor */
+ table = get_next_level_table(&table[l2_index]);
+ if (!table)
+ return 0;
+ }
+
+ /* L3 table lookup */
+ desc = base_addr | PAGE_DESC | attr;
+ table[l3_index] = desc;
+ return L3_XLAT_SIZE;
+}
+
+/*
+ * Func : sanity_check
+ * Desc : Check if the address is aligned and size is atleast the granule size
+ */
+static uint64_t sanity_check(uint64_t addr,
+ uint64_t size)
+{
+ /* Address should be atleast 64 KiB aligned */
+ if (addr & GRANULE_SIZE_MASK)
+ return 1;
+
+ /* Size should be atleast granule size */
+ if (size < GRANULE_SIZE)
+ return 1;
+
+ return 0;
+}
+
+/*
+ * Func : init_mmap_entry
+ * Desc : For each mmap entry, this function calls init_xlat_table with the base
+ * address. Based on size returned from init_xlat_table, base_addr is updated
+ * and subsequent calls are made for initializing the xlat table until the whole
+ * region is initialized.
+ */
+static void init_mmap_entry(struct mmu_memrange *r)
+{
+ uint64_t base_addr = r->base;
+ uint64_t size = r->size;
+ uint64_t tag = r->type;
+ uint64_t temp_size = size;
+
+ while (temp_size) {
+ uint64_t ret;
+
+ if (sanity_check(base_addr,temp_size)) {
+ printf("Libpayload: ARM64 MMU: sanity check failed\n");
+ return;
+ }
+
+ ret = init_xlat_table(base_addr + (size - temp_size),
+ temp_size, tag);
+
+ if (ret == 0)
+ return;
+
+ temp_size -= ret;
+ }
+}
+
+/*
+ * Func : mmu_init
+ * Desc : Initialize mmu based on the mmu_memrange passed. ttb_buffer is used as
+ * the base address for xlat tables. TTB_DEFAULT_SIZE defines the max number of
+ * tables that can be used
+ * Assuming that memory 0-2GiB is device memory.
+ */
+uint64_t mmu_init(struct mmu_ranges *mmu_ranges)
+{
+ struct mmu_memrange devrange = { 0, 0x80000000, TYPE_DEV_MEM };
+
+ int i = 0;
+
+ xlat_addr = (uint64_t *)&ttb_buffer;
+
+ memset((void*)xlat_addr, 0, GRANULE_SIZE);
+ max_tables = (TTB_DEFAULT_SIZE >> GRANULE_SIZE_SHIFT);
+ free_idx = 1;
+
+ printf("Libpayload ARM64: TTB_BUFFER: 0x%p Max Tables: %d\n",
+ (void*)xlat_addr, max_tables);
+
+ init_mmap_entry(&devrange);
+
+ for (; i < mmu_ranges->used; i++) {
+ init_mmap_entry(&mmu_ranges->entries[i]);
+ }
+
+ printf("Libpayload ARM64: MMU init done\n");
+ return 0;
+}
+
+static uint32_t is_mmu_enabled(void)
+{
+ uint32_t sctlr;
+
+ sctlr = raw_read_sctlr_current();
+
+ return (sctlr & SCTLR_M);
+}
+
+/*
+ * Func: mmu_disable
+ * Desc: Invalidate caches and disable mmu
+ */
+void mmu_disable(void)
+{
+ uint32_t sctlr;
+
+ sctlr = raw_read_sctlr_current();
+ sctlr &= ~(SCTLR_C | SCTLR_M | SCTLR_I);
+
+ tlbiall_current();
+ dcache_clean_invalidate_all();
+
+ dsb();
+ isb();
+
+ raw_write_sctlr_current(sctlr);
+
+ dcache_clean_invalidate_all();
+ dsb();
+ isb();
+}
+
+/*
+ * Func: mmu_enable
+ * Desc: Initialize MAIR, TCR, TTBR and enable MMU by setting appropriate bits
+ * in SCTLR
+ */
+void mmu_enable(void)
+{
+ uint32_t sctlr;
+
+ /* Initialize MAIR indices */
+ raw_write_mair_current(MAIR_ATTRIBUTES);
+
+ /* Invalidate TLBs */
+ tlbiall_current();
+
+ /* Initialize TCR flags */
+ raw_write_tcr_current(TCR_TOSZ | TCR_IRGN0_NM_WBWAC | TCR_ORGN0_NM_WBWAC |
+ TCR_SH0_IS | TCR_TG0_64KB | TCR_PS_64GB |
+ TCR_TBI_USED);
+
+ /* Initialize TTBR */
+ raw_write_ttbr0_current((uintptr_t)xlat_addr);
+
+ /* Ensure all translation table writes are committed before enabling MMU */
+ dsb();
+ isb();
+
+ /* Enable MMU */
+ sctlr = raw_read_sctlr_current();
+ sctlr |= SCTLR_C | SCTLR_M | SCTLR_I;
+ raw_write_sctlr_current(sctlr);
+
+ isb();
+
+ if(is_mmu_enabled())
+ printf("ARM64: MMU enable done\n");
+ else
+ printf("ARM64: MMU enable failed\n");
+}
+
+/*
+ * Func: mmu_is_dma_range_valid
+ * Desc: We need to ensure that the dma buffer being allocated doesnt overlap
+ * with any used memory range. Basically:
+ * 1. Memory ranges used by the payload (usedmem_ranges)
+ * 2. Any area that falls below _end symbol in linker script (Kernel needs to be
+ * loaded in lower areas of memory, So, the payload linker script can have
+ * kernel memory below _start and _end. Thus, we want to make sure we do not
+ * step in those areas as well.
+ * Returns: 1 on success, 0 on error
+ * ASSUMPTION: All the memory used by payload resides below the program
+ * proper. If there is any memory used above the _end symbol, then it should be
+ * marked as used memory in usedmem_ranges during the presysinfo_scan.
+ */
+static int mmu_is_dma_range_valid(uint64_t dma_base,
+ uint64_t dma_end)
+{
+ uint64_t payload_end = (uint64_t)&_end;
+ uint64_t i = 0;
+ struct mmu_memrange *r = &usedmem_ranges.entries[0];
+
+ if ((dma_base <= payload_end) || (dma_end <= payload_end))
+ return 0;
+
+ for (; i < usedmem_ranges.used; i++) {
+ uint64_t start = r[i].base;
+ uint64_t end = start + r[i].size;
+
+ if (((dma_base >= start) && (dma_base <= end)) ||
+ ((dma_end >= start) && (dma_end <= end)))
+ return 0;
+ }
+
+ return 1;
+}
+
+/*
+ * Func: mmu_add_dma_range
+ * Desc: Add a memrange for dma operations. This is special because we want to
+ * initialize this memory as non-cacheable. We have a constraint that the DMA
+ * buffer should be below 4GiB(32-bit only). So, we lookup a TYPE_NORMAL_MEM
+ * from the lowest available addresses and align it to page size i.e. 64KiB.
+ */
+static struct mmu_memrange* mmu_add_dma_range(struct mmu_ranges *mmu_ranges)
+{
+ int i = 0;
+ struct mmu_memrange *r = &mmu_ranges->entries[0];
+
+ for (; i < mmu_ranges->used; i++) {
+
+ if ((r[i].type != TYPE_NORMAL_MEM) ||
+ (r[i].size < DMA_DEFAULT_SIZE) ||
+ (r[i].base >= MIN_64_BIT_ADDR))
+ continue;
+
+ uint64_t base_addr;
+ uint64_t range_end_addr = r[i].base + r[i].size;
+ uint64_t size;
+ uint64_t end_addr = range_end_addr;
+
+ /* Make sure we choose only 32-bit address range for DMA */
+ if (end_addr > MIN_64_BIT_ADDR)
+ end_addr = MIN_64_BIT_ADDR;
+
+ /*
+ * We need to ensure that we do not step over payload regions or
+ * the coreboot_table
+ */
+ do {
+ /*
+ * If end_addr is aligned to GRANULE_SIZE,
+ * then base_addr will be too.
+ * (DMA_DEFAULT_SIZE is multiple of GRANULE_SIZE)
+ */
+ assert((DMA_DEFAULT_SIZE % GRANULE_SIZE) == 0);
+ end_addr = ALIGN_DOWN(end_addr, GRANULE_SIZE);
+
+ base_addr = end_addr - DMA_DEFAULT_SIZE;
+ size = end_addr - base_addr;
+
+ if (base_addr < r[i].base)
+ break;
+ } while (mmu_is_dma_range_valid(base_addr, end_addr) == 0);
+
+ if (base_addr < r[i].base)
+ continue;
+
+ if (r[i].size == size) {
+ r[i].type = TYPE_DMA_MEM;
+ return &r[i];
+ }
+
+ if (end_addr != range_end_addr) {
+ /* Add a new memrange since we split up one
+ * range crossing the 4GiB boundary or doing an
+ * ALIGN_DOWN on end_addr.
+ */
+ r[i].size -= (range_end_addr - end_addr);
+ if (mmu_add_memrange(mmu_ranges, end_addr,
+ range_end_addr - end_addr,
+ TYPE_NORMAL_MEM) == NULL)
+ mmu_error();
+ }
+
+ r[i].size -= size;
+
+ r = mmu_add_memrange(mmu_ranges, base_addr, size, TYPE_DMA_MEM);
+
+ if (r == NULL)
+ mmu_error();
+
+ return r;
+ }
+
+ /* Should never reach here if everything went fine */
+ printf("ARM64 ERROR: No DMA region allocated\n");
+ return NULL;
+}
+
+/*
+ * Func: mmu_extract_ranges
+ * Desc: Assumption is that coreboot tables have memranges in sorted
+ * order. So, if there is an opportunity to combine ranges, we do that as
+ * well. Memranges are initialized for both CB_MEM_RAM and CB_MEM_TABLE as
+ * TYPE_NORMAL_MEM.
+ */
+static void mmu_extract_ranges(struct memrange *cb_ranges,
+ uint64_t ncb,
+ struct mmu_ranges *mmu_ranges)
+{
+ int i = 0;
+ struct mmu_memrange *prev_range = NULL;
+
+ /* Extract memory ranges to be mapped */
+ for (; i < ncb; i++) {
+ switch (cb_ranges[i].type) {
+ case CB_MEM_RAM:
+ case CB_MEM_TABLE:
+ if (prev_range && (prev_range->base + prev_range->size
+ == cb_ranges[i].base)) {
+ prev_range->size += cb_ranges[i].size;
+ } else {
+ prev_range = mmu_add_memrange(mmu_ranges,
+ cb_ranges[i].base,
+ cb_ranges[i].size,
+ TYPE_NORMAL_MEM);
+ if (prev_range == NULL)
+ mmu_error();
+ }
+ break;
+ default:
+ break;
+ }
+ }
+}
+
+/*
+ * Func: mmu_init_ranges
+ * Desc: Initialize mmu_memranges based on the memranges obtained from coreboot
+ * tables. Also, initialize dma memrange and xlat_addr for ttb buffer.
+ */
+struct mmu_memrange *mmu_init_ranges_from_sysinfo(struct memrange *cb_ranges,
+ uint64_t ncb,
+ struct mmu_ranges *mmu_ranges)
+{
+ struct mmu_memrange *dma_range;
+
+ /* Extract ranges from memrange in lib_sysinfo */
+ mmu_extract_ranges(cb_ranges, ncb, mmu_ranges);
+
+ /* Get a range for dma */
+ dma_range = mmu_add_dma_range(mmu_ranges);
+
+ if (dma_range == NULL)
+ mmu_error();
+
+ return dma_range;
+}
+
+/*
+ * Func: mmu_add_memrange
+ * Desc: Adds a new memory range
+ */
+struct mmu_memrange* mmu_add_memrange(struct mmu_ranges *r, uint64_t base,
+ uint64_t size, uint64_t type)
+{
+ struct mmu_memrange *curr = NULL;
+ int i = r->used;
+
+ if (i < ARRAY_SIZE(r->entries)) {
+ curr = &r->entries[i];
+ curr->base = base;
+ curr->size = size;
+ curr->type = type;
+
+ r->used = i + 1;
+ }
+
+ return curr;
+}
+
+/*
+ * Func: mmu_presysinfo_memory_used
+ * Desc: Initializes all the memory used for presysinfo page table
+ * initialization and enabling of MMU. All these ranges are stored in
+ * usedmem_ranges. usedmem_ranges plays an important role in selecting the dma
+ * buffer as well since we check the dma buffer range against the used memory
+ * ranges to prevent any overstepping.
+ */
+void mmu_presysinfo_memory_used(uint64_t base, uint64_t size)
+{
+ uint64_t range_base;
+
+ range_base = ALIGN_DOWN(base, GRANULE_SIZE);
+
+ size += (base - range_base);
+ size = ALIGN_UP(size, GRANULE_SIZE);
+
+ mmu_add_memrange(&usedmem_ranges, range_base, size, TYPE_NORMAL_MEM);
+}
+
+void mmu_presysinfo_enable(void)
+{
+ mmu_init(&usedmem_ranges);
+ mmu_enable();
+}
diff --git a/payloads/libpayload/include/arm64/arch/cache.h b/payloads/libpayload/include/arm64/arch/cache.h
index 5a0b3b0..cfd3109 100644
--- a/payloads/libpayload/include/arm64/arch/cache.h
+++ b/payloads/libpayload/include/arm64/arch/cache.h
@@ -107,9 +107,6 @@ void tlb_invalidate_all(void);
* Generalized setup/init functions
*/
-/* mmu initialization (set page table address, set permissions, etc) */
-void mmu_init(void);
-
enum dcache_policy {
DCACHE_OFF,
DCACHE_WRITEBACK,
diff --git a/payloads/libpayload/include/arm64/arch/mmu.h b/payloads/libpayload/include/arm64/arch/mmu.h
new file mode 100644
index 0000000..0937f4b
--- /dev/null
+++ b/payloads/libpayload/include/arm64/arch/mmu.h
@@ -0,0 +1,213 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2014 Google Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef __ARCH_ARM64_MMU_H__
+#define __ARCH_ARM64_MMU_H__
+
+#include <libpayload.h>
+
+struct mmu_memrange {
+ uint64_t base;
+ uint64_t size;
+ uint64_t type;
+};
+
+struct mmu_ranges {
+ struct mmu_memrange entries[SYSINFO_MAX_MEM_RANGES];
+ size_t used;
+};
+
+/*
+ * Symbols taken from linker script
+ * They mark the start and end of the region used by payload
+ */
+extern char _start[], _end[];
+
+/* IMPORTANT!!!!!!!
+ * Assumptions made:
+ * Granule size is 64KiB
+ * BITS per Virtual address is 33
+ * All the calculations for tables L1,L2 and L3 are based on these assumptions
+ * If these values are changed, recalculate the other macros as well
+ */
+
+/* Memory attributes for mmap regions
+ * These attributes act as tag values for memrange regions
+ */
+
+#define TYPE_NORMAL_MEM 1
+#define TYPE_DEV_MEM 2
+#define TYPE_DMA_MEM 3
+
+/* Descriptor attributes */
+
+#define INVALID_DESC 0x0
+#define BLOCK_DESC 0x1
+#define TABLE_DESC 0x3
+#define PAGE_DESC 0x3
+
+/* Block descriptor */
+#define BLOCK_NS (1 << 5)
+
+#define BLOCK_AP_RW (0 << 7)
+#define BLOCK_AP_RO (1 << 7)
+
+#define BLOCK_ACCESS (1 << 10)
+
+/* XLAT Table Init Attributes */
+
+#define VA_START 0x0
+/* If BITS_PER_VA or GRANULE_SIZE are changed, recalculate and change the
+ macros following them */
+#define BITS_PER_VA 33
+/* Granule size of 64KB is being used */
+#define MIN_64_BIT_ADDR (1UL << 32)
+#define XLAT_TABLE_MASK ~(0xffffUL)
+#define GRANULE_SIZE_SHIFT 16
+#define GRANULE_SIZE (1 << GRANULE_SIZE_SHIFT)
+#define GRANULE_SIZE_MASK ((1 << 16) - 1)
+
+#define L1_ADDR_SHIFT 42
+#define L2_ADDR_SHIFT 29
+#define L3_ADDR_SHIFT 16
+
+#define L1_ADDR_MASK (0UL << L1_ADDR_SHIFT)
+#define L2_ADDR_MASK (0xfUL << L2_ADDR_SHIFT)
+#define L3_ADDR_MASK (0x1fffUL << L3_ADDR_SHIFT)
+
+/* Dependent on BITS_PER_VA and GRANULE_SIZE */
+#define INIT_LEVEL 2
+#define XLAT_MAX_LEVEL 3
+
+/* Each entry in XLAT table is 8 bytes */
+#define XLAT_ENTRY_SHIFT 3
+#define XLAT_ENTRY_SIZE (1 << XLAT_ENTRY_SHIFT)
+
+#define XLAT_TABLE_SHIFT GRANULE_SIZE_SHIFT
+#define XLAT_TABLE_SIZE (1 << XLAT_TABLE_SHIFT)
+
+#define XLAT_NUM_ENTRIES_SHIFT (XLAT_TABLE_SHIFT - XLAT_ENTRY_SHIFT)
+#define XLAT_NUM_ENTRIES (1 << XLAT_NUM_ENTRIES_SHIFT)
+
+#define L3_XLAT_SIZE_SHIFT (GRANULE_SIZE_SHIFT)
+#define L2_XLAT_SIZE_SHIFT (GRANULE_SIZE_SHIFT + XLAT_NUM_ENTRIES_SHIFT)
+#define L1_XLAT_SIZE_SHIFT (GRANULE_SIZE_SHIFT + XLAT_NUM_ENTRIES_SHIFT)
+
+/* These macros give the size of the region addressed by each entry of a xlat
+ table at any given level */
+#define L3_XLAT_SIZE (1 << L3_XLAT_SIZE_SHIFT)
+#define L2_XLAT_SIZE (1 << L2_XLAT_SIZE_SHIFT)
+#define L1_XLAT_SIZE (1 << L1_XLAT_SIZE_SHIFT)
+
+/* Block indices required for MAIR */
+#define BLOCK_INDEX_MEM_DEV_NGNRNE 0
+#define BLOCK_INDEX_MEM_DEV_NGNRE 1
+#define BLOCK_INDEX_MEM_DEV_GRE 2
+#define BLOCK_INDEX_MEM_NORMAL_NC 3
+#define BLOCK_INDEX_MEM_NORMAL 4
+
+#define BLOCK_INDEX_SHIFT 2
+
+/* MAIR attributes */
+#define MAIR_ATTRIBUTES ((0x00 << (BLOCK_INDEX_MEM_DEV_NGNRNE*8)) | \
+ (0x04 << (BLOCK_INDEX_MEM_DEV_NGNRE*8)) | \
+ (0x0c << (BLOCK_INDEX_MEM_DEV_GRE*8)) | \
+ (0x44 << (BLOCK_INDEX_MEM_NORMAL_NC*8)) | \
+ (0xffUL << (BLOCK_INDEX_MEM_NORMAL*8)))
+
+/* TCR attributes */
+#define TCR_TOSZ (64 - BITS_PER_VA)
+
+#define TCR_IRGN0_SHIFT 8
+#define TCR_IRGN0_NM_NC (0x00 << TCR_IRGN0_SHIFT)
+#define TCR_IRGN0_NM_WBWAC (0x01 << TCR_IRGN0_SHIFT)
+#define TCR_IRGN0_NM_WTC (0x02 << TCR_IRGN0_SHIFT)
+#define TCR_IRGN0_NM_WBNWAC (0x03 << TCR_IRGN0_SHIFT)
+
+#define TCR_ORGN0_SHIFT 10
+#define TCR_ORGN0_NM_NC (0x00 << TCR_ORGN0_SHIFT)
+#define TCR_ORGN0_NM_WBWAC (0x01 << TCR_ORGN0_SHIFT)
+#define TCR_ORGN0_NM_WTC (0x02 << TCR_ORGN0_SHIFT)
+#define TCR_ORGN0_NM_WBNWAC (0x03 << TCR_ORGN0_SHIFT)
+
+#define TCR_SH0_SHIFT 12
+#define TCR_SH0_NC (0x0 << TCR_SH0_SHIFT)
+#define TCR_SH0_OS (0x2 << TCR_SH0_SHIFT)
+#define TCR_SH0_IS (0x3 << TCR_SH0_SHIFT)
+
+#define TCR_TG0_SHIFT 14
+#define TCR_TG0_4KB (0x0 << TCR_TG0_SHIFT)
+#define TCR_TG0_64KB (0x1 << TCR_TG0_SHIFT)
+#define TCR_TG0_16KB (0x2 << TCR_TG0_SHIFT)
+
+#define TCR_PS_SHIFT 16
+#define TCR_PS_4GB (0x0 << TCR_PS_SHIFT)
+#define TCR_PS_64GB (0x1 << TCR_PS_SHIFT)
+#define TCR_PS_1TB (0x2 << TCR_PS_SHIFT)
+#define TCR_PS_4TB (0x3 << TCR_PS_SHIFT)
+#define TCR_PS_16TB (0x4 << TCR_PS_SHIFT)
+#define TCR_PS_256TB (0x5 << TCR_PS_SHIFT)
+
+#define TCR_TBI_SHIFT 20
+#define TCR_TBI_USED (0x0 << TCR_TBI_SHIFT)
+#define TCR_TBI_IGNORED (0x1 << TCR_TBI_SHIFT)
+
+#define DMA_DEFAULT_SIZE (0x20 * GRANULE_SIZE)
+#define TTB_DEFAULT_SIZE 0x100000
+
+/* Initialize the MMU TTB tables using the mmu_ranges */
+uint64_t mmu_init(struct mmu_ranges *mmu_ranges);
+
+/* Enable the mmu based on previous mmu_init(). */
+void mmu_enable(void);
+
+/* Disable mmu */
+void mmu_disable(void);
+
+/*
+ * Based on the memory ranges provided in coreboot tables,
+ * initialize the mmu_memranges used for mmu initialization
+ * cb_ranges -> Memory ranges present in cb tables
+ * mmu_ranges -> mmu_memranges initialized by this function
+ */
+struct mmu_memrange* mmu_init_ranges_from_sysinfo(struct memrange *cb_ranges,
+ uint64_t ncb,
+ struct mmu_ranges *mmu_ranges);
+
+/* Add a new mmu_memrange */
+struct mmu_memrange* mmu_add_memrange(struct mmu_ranges *r, uint64_t base,
+ uint64_t size, uint64_t type);
+
+/*
+ * Functions for handling the initialization of memory ranges and enabling mmu
+ * before coreboot tables are parsed
+ */
+void mmu_presysinfo_memory_used(uint64_t base, uint64_t size);
+void mmu_presysinfo_enable(void);
+#endif // __ARCH_ARM64_MMU_H__
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