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platform: Allow platforms to specify heap size

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We extend struct sbi_platform and struct sbi_scratch to allow platforms
specify the heap size to the OpenSBI firmwares. The OpenSBI firmwares
will use this information to determine the location of heap and provide
heap base address in per-HART scratch space.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
This commit is contained in:
Anup Patel
2023-04-17 11:28:03 +05:30
committed by Anup Patel
parent aad7a37705
commit 5cf9a54016
9 changed files with 58 additions and 14 deletions
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15
firmware/fw_base.S
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@@ -255,20 +255,28 @@ _bss_zero:
/* Preload HART details
* s7 -> HART Count
* s8 -> HART Stack Size
* s9 -> Heap Size
* s10 -> Heap Offset
*/
lla a4, platform
#if __riscv_xlen > 32
lwu s7, SBI_PLATFORM_HART_COUNT_OFFSET(a4)
lwu s8, SBI_PLATFORM_HART_STACK_SIZE_OFFSET(a4)
lwu s9, SBI_PLATFORM_HEAP_SIZE_OFFSET(a4)
#else
lw s7, SBI_PLATFORM_HART_COUNT_OFFSET(a4)
lw s8, SBI_PLATFORM_HART_STACK_SIZE_OFFSET(a4)
lw s9, SBI_PLATFORM_HEAP_SIZE_OFFSET(a4)
#endif
/* Setup scratch space for all the HARTs*/
lla tp, _fw_end
mul a5, s7, s8
add tp, tp, a5
/* Setup heap base address */
lla s10, _fw_start
sub s10, tp, s10
add tp, tp, s9
/* Keep a copy of tp */
add t3, tp, zero
/* Counter */
@@ -283,8 +291,11 @@ _scratch_init:
* t3 -> the firmware end address
* s7 -> HART count
* s8 -> HART stack size
* s9 -> Heap Size
* s10 -> Heap Offset
*/
add tp, t3, zero
sub tp, tp, s9
mul a5, s8, t1
sub tp, tp, a5
li a5, SBI_SCRATCH_SIZE
@@ -302,6 +313,10 @@ _scratch_init:
REG_L a5, 0(a4)
REG_S a5, SBI_SCRATCH_FW_RW_OFFSET(tp)
/* Store fw_heap_offset and fw_heap_size in scratch space */
REG_S s10, SBI_SCRATCH_FW_HEAP_OFFSET(tp)
REG_S s9, SBI_SCRATCH_FW_HEAP_SIZE_OFFSET(tp)
/* Store next arg1 in scratch space */
MOV_3R s0, a0, s1, a1, s2, a2
call fw_next_arg1