mirror of
https://github.com/Fishwaldo/opensbi.git
synced 2025-03-15 19:31:32 +00:00
firmware: Allow fw_platform_init() to return updated FDT location
Currently, the fw_platform_init() does not return anything but we can further improve by allowing fw_platform_init() to return updated FDT location. It is certainly not mandatory for fw_platform_init() to return a new location of FDT (or modify FDT). In fact, the fw_platform_init() can always return the original FDT location (i.e. 'arg1') unmodified. This new capability of fw_platform_init() will allow platforms to: 1. Have multiple built-in FDTs and select one 2. Modify FDT before using based on platform specific straps or OTP Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
parent
4ce6b7a82a
commit
86ec5341e4
2 changed files with 12 additions and 4 deletions
|
@ -198,7 +198,9 @@ _prev_arg1_override_done:
|
|||
*/
|
||||
MOV_5R s0, a0, s1, a1, s2, a2, s3, a3, s4, a4
|
||||
call fw_platform_init
|
||||
add t0, a0, zero
|
||||
MOV_5R a0, s0, a1, s1, a2, s2, a3, s3, a4, s4
|
||||
add a1, t0, zero
|
||||
|
||||
/* Preload HART details
|
||||
* s7 -> HART Count
|
||||
|
@ -475,6 +477,7 @@ _start_hang:
|
|||
.globl fw_platform_init
|
||||
.weak fw_platform_init
|
||||
fw_platform_init:
|
||||
add a0, a1, zero
|
||||
ret
|
||||
|
||||
.section .entry, "ax", %progbits
|
||||
|
|
|
@ -62,10 +62,14 @@ static u32 generic_hart_index2id[SBI_HARTMASK_MAX_BITS] = { 0 };
|
|||
* The arguments passed to fw_platform_init() function are boot time state
|
||||
* of A0 to A4 register. The "arg0" will be boot HART id and "arg1" will
|
||||
* be address of FDT passed by previous booting stage.
|
||||
*
|
||||
* The return value of fw_platform_init() function is the FDT location. If
|
||||
* FDT is unchanged (or FDT is modified in-place) then fw_platform_init()
|
||||
* can always return the original FDT location (i.e. 'arg1') unmodified.
|
||||
*/
|
||||
void fw_platform_init(unsigned long arg0, unsigned long arg1,
|
||||
unsigned long arg2, unsigned long arg3,
|
||||
unsigned long arg4)
|
||||
unsigned long fw_platform_init(unsigned long arg0, unsigned long arg1,
|
||||
unsigned long arg2, unsigned long arg3,
|
||||
unsigned long arg4)
|
||||
{
|
||||
const char *model, *mmu_type;
|
||||
void *fdt = (void *)arg1;
|
||||
|
@ -106,7 +110,8 @@ void fw_platform_init(unsigned long arg0, unsigned long arg1,
|
|||
|
||||
platform.hart_count = hart_count;
|
||||
|
||||
return;
|
||||
/* Return original FDT pointer */
|
||||
return arg1;
|
||||
|
||||
fail:
|
||||
while (1)
|
||||
|
|
Loading…
Add table
Reference in a new issue