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firmware: Remove stack section from common linker script

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We don't need a separate stack section for per-HART stack
instead we create per-HART stack at the end of firmware
(i.e. after _fw_end symbol).

Signed-off-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Anup Patel 2018-12-22 12:02:31 +05:30 • committed by Anup Patel
parent 24b4d48674
commit 1cf7ec9e3b
2 changed files with 42 additions and 31 deletions
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61
firmware/fw_common.S
View file

@ -122,18 +122,28 @@ _start_warm:
csrw mie, zero
csrw mip, zero
/* set MSIE bit to receive IPI */
/* Set MSIE bit to receive IPI */
li a2, MIP_MSIP
csrw mie, a2
/* Preload per-HART details
* s6 -> HART ID
* s7 -> HART Count
* s8 -> HART Stack Size
*/
csrr s6, mhartid
li s7, PLAT_HART_COUNT
li s8, PLAT_HART_STACK_SIZE
/* HART ID should be within expected limit */
csrr a6, mhartid
li a5, PLAT_HART_COUNT
bge a6, a5, _start_hang
csrr s6, mhartid
bge s6, s7, _start_hang
/* Setup scratch space */
li a5, PLAT_HART_STACK_SIZE
la tp, _stack_end
mul a5, a5, a6
la tp, _fw_end
mul a5, s7, s8
add tp, tp, a5
mul a5, s8, s6
sub tp, tp, a5
li a5, RISCV_SCRATCH_SIZE
sub tp, tp, a5
@ -143,6 +153,8 @@ _start_warm:
REG_S zero, RISCV_SCRATCH_TMP0_OFFSET(tp)
la a4, _fw_start
la a5, _fw_end
mul t0, s7, s8
add a5, a5, t0
sub a5, a5, a4
REG_S a4, RISCV_SCRATCH_FW_START_OFFSET(tp)
REG_S a5, RISCV_SCRATCH_FW_SIZE_OFFSET(tp)
@ -180,18 +192,29 @@ _start_warm:
.section .entry, "ax", %progbits
.globl _hartid_to_scratch
_hartid_to_scratch:
add sp, sp, -(2 * __SIZEOF_POINTER__)
REG_S a1, (sp)
REG_S a2, (__SIZEOF_POINTER__)(sp)
li a1, PLAT_HART_STACK_SIZE
la a2, _stack_end
mul a1, a1, a0
sub a2, a2, a1
li a1, RISCV_SCRATCH_SIZE
sub a0, a2, a1
REG_L a1, (sp)
REG_L a2, (__SIZEOF_POINTER__)(sp)
add sp, sp, (2 * __SIZEOF_POINTER__)
add sp, sp, -(3 * __SIZEOF_POINTER__)
REG_S s0, (sp)
REG_S s1, (__SIZEOF_POINTER__)(sp)
REG_S s2, (__SIZEOF_POINTER__ * 2)(sp)
/*
* a0 -> HART ID (passed by caller)
* s0 -> HART Stack Size
* s1 -> HART Stack End
* s2 -> Temporary
*/
li s0, PLAT_HART_STACK_SIZE
li s2, PLAT_HART_COUNT
mul s2, s2, s0
la s1, _fw_end
add s1, s1, s2
mul s2, s0, a0
sub s1, s1, s2
li s2, RISCV_SCRATCH_SIZE
sub a0, s1, s2
REG_L s0, (sp)
REG_L s1, (__SIZEOF_POINTER__)(sp)
REG_L s2, (__SIZEOF_POINTER__ * 2)(sp)
add sp, sp, (3 * __SIZEOF_POINTER__)
ret
.align 3

12
firmware/fw_common.ldS
View file

@ -61,18 +61,6 @@
. = ALIGN(0x1000); /* Ensure next section is page aligned */
.stack :
{
PROVIDE(_stack_start = .);
*(.stack)
*(.stack.*)
. = . + (PLAT_HART_STACK_SIZE * PLAT_HART_COUNT);
. = ALIGN(8);
PROVIDE(_stack_end = .);
}
. = ALIGN(0x1000); /* Ensure next section is page aligned */
.bss :
{
PROVIDE(_bss_start = .);