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board_f.c: Ensure 16 alignment of start_addr_sp and reserved memory 

Add a function reserve_stack_aligned() to reserved memory with 16 bits
alignment after the stack pointer (gd->start_addr_sp) and use this new
function in board_f.c to reserve all the memory area (malloc, board, gd,
fdt, bootstage, stacks).

This 16 byte alignment is needed for cast on struct pointer
for the reserved memory, for example:
+ x86_64 ABI: https://reviews.llvm.org/D30049: 16 bytes
+ ARMv8 Instruction Set Overview: quad word, 16 bytes

An other alignment value could be needed for other architecture.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Acked-by: Stephen Warren <swarren@nvidia.com>
This commit is contained in:
Patrick Delaunay 2020-03-10 10:15:05 +01:00 committed by Tom Rini
parent 6de299230f
commit 65c141ebbd
1 changed files with 18 additions and 14 deletions
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32
common/board_f.c
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@ -472,6 +472,17 @@ static int reserve_uboot(void)
return 0;
}
/*
* reserve after start_addr_sp the requested size and make the stack pointer
* 16-byte aligned, this alignment is needed for cast on the reserved memory
* ref = x86_64 ABI: https://reviews.llvm.org/D30049: 16 bytes
* = ARMv8 Instruction Set Overview: quad word, 16 bytes
*/
static unsigned long reserve_stack_aligned(size_t size)
{
return ALIGN_DOWN(gd->start_addr_sp - size, 16);
}
#ifdef CONFIG_SYS_NONCACHED_MEMORY
static int reserve_noncached(void)
{
@ -497,7 +508,7 @@ static int reserve_noncached(void)
/* reserve memory for malloc() area */
static int reserve_malloc(void)
{
gd->start_addr_sp = gd->start_addr_sp - TOTAL_MALLOC_LEN;
gd->start_addr_sp = reserve_stack_aligned(TOTAL_MALLOC_LEN);
debug("Reserving %dk for malloc() at: %08lx\n",
TOTAL_MALLOC_LEN >> 10, gd->start_addr_sp);
#ifdef CONFIG_SYS_NONCACHED_MEMORY
@ -511,7 +522,7 @@ static int reserve_malloc(void)
static int reserve_board(void)
{
if (!gd->bd) {
gd->start_addr_sp -= sizeof(bd_t);
gd->start_addr_sp = reserve_stack_aligned(sizeof(bd_t));
gd->bd = (bd_t *)map_sysmem(gd->start_addr_sp, sizeof(bd_t));
memset(gd->bd, '\0', sizeof(bd_t));
debug("Reserving %zu Bytes for Board Info at: %08lx\n",
@ -530,7 +541,7 @@ static int setup_machine(void)
static int reserve_global_data(void)
{
gd->start_addr_sp -= sizeof(gd_t);
gd->start_addr_sp = reserve_stack_aligned(sizeof(gd_t));
gd->new_gd = (gd_t *)map_sysmem(gd->start_addr_sp, sizeof(gd_t));
debug("Reserving %zu Bytes for Global Data at: %08lx\n",
sizeof(gd_t), gd->start_addr_sp);
@ -548,7 +559,7 @@ static int reserve_fdt(void)
if (gd->fdt_blob) {
gd->fdt_size = ALIGN(fdt_totalsize(gd->fdt_blob) + 0x1000, 32);
gd->start_addr_sp -= gd->fdt_size;
gd->start_addr_sp = reserve_stack_aligned(gd->fdt_size);
gd->new_fdt = map_sysmem(gd->start_addr_sp, gd->fdt_size);
debug("Reserving %lu Bytes for FDT at: %08lx\n",
gd->fdt_size, gd->start_addr_sp);
@ -563,12 +574,7 @@ static int reserve_bootstage(void)
#ifdef CONFIG_BOOTSTAGE
int size = bootstage_get_size();
gd->start_addr_sp -= size;
/*
* Ensure that start_addr_sp is aligned down to reserve enough
* space for new_bootstage
*/
gd->start_addr_sp = ALIGN_DOWN(gd->start_addr_sp, 16);
gd->start_addr_sp = reserve_stack_aligned(size);
gd->new_bootstage = map_sysmem(gd->start_addr_sp, size);
debug("Reserving %#x Bytes for bootstage at: %08lx\n", size,
gd->start_addr_sp);
@ -585,8 +591,7 @@ __weak int arch_reserve_stacks(void)
static int reserve_stacks(void)
{
/* make stack pointer 16-byte aligned */
gd->start_addr_sp -= 16;
gd->start_addr_sp &= ~0xf;
gd->start_addr_sp = reserve_stack_aligned(16);
/*
* let the architecture-specific code tailor gd->start_addr_sp and
@ -598,8 +603,7 @@ static int reserve_stacks(void)
static int reserve_bloblist(void)
{
#ifdef CONFIG_BLOBLIST
gd->start_addr_sp &= ~0xf;
gd->start_addr_sp -= CONFIG_BLOBLIST_SIZE;
gd->start_addr_sp = reserve_stack_aligned(CONFIG_BLOBLIST_SIZE);
gd->new_bloblist = map_sysmem(gd->start_addr_sp, CONFIG_BLOBLIST_SIZE);
#endif