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firmware: Allow firmwares to provide next mode and options

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This patch extends existing firmwares (i.e. fw_jump and fw_payload)
to explicitly provide next mode and options to fw_base.

We also introduce fw_save_info() which is called by fw_base very
early on boot HART. This function can be used by existing firmwares
(i.e. fw_jump and fw_payload) to save information passed by previous
booting stage.

Overall, this is a preparatory patch for implementing fw_dynamic.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Anup Patel
2019-04-29 10:44:15 +05:30
committed by Anup Patel
parent 243a5e0532
commit 25472de89e
3 changed files with 148 additions and 25 deletions
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50
firmware/fw_jump.S
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@@ -9,19 +9,37 @@
#include "fw_base.S"
.align 3
.section .entry, "ax", %progbits
.global fw_save_info
/*
* We can only use a0, a1, a2, a3, and a4 registers here.
* The a0, a1, and a2 registers will be same as passed by
* previous booting stage.
* Nothing to be returned here.
*/
fw_save_info:
ret
.align 3
.section .entry, "ax", %progbits
.global fw_prev_arg1
/*
* We can only use a0, a1, and a2 registers here.
* The previous arg1 should be returned in 'a0'.
*/
fw_prev_arg1:
/* We return previous arg1 in 'a0' */
add a0, zero, zero
ret
.align 3
.section .entry, "ax", %progbits
.global fw_next_arg1
/*
* We can only use a0, a1, and a2 registers here.
* The next arg1 should be returned in 'a0'.
*/
fw_next_arg1:
/* We return next arg1 in 'a0' */
#ifdef FW_JUMP_FDT_ADDR
li a0, FW_JUMP_FDT_ADDR
#else
@@ -32,12 +50,38 @@ fw_next_arg1:
.align 3
.section .entry, "ax", %progbits
.global fw_next_addr
/*
* We can only use a0, a1, and a2 registers here.
* The next address should be returned in 'a0'.
*/
fw_next_addr:
/* We return next address in 'a0' */
la a0, _jump_addr
REG_L a0, (a0)
ret
.align 3
.section .entry, "ax", %progbits
.global fw_next_mode
/*
* We can only use a0, a1, and a2 registers here.
* The next address should be returned in 'a0'
*/
fw_next_mode:
li a0, PRV_S
ret
.align 3
.section .entry, "ax", %progbits
.global fw_options
/*
* We can only use a0, a1, and a2 registers here.
* The 'a4' register will have default options.
* The next address should be returned in 'a0'.
*/
fw_options:
add a0, zero, zero
ret
#ifndef FW_JUMP_ADDR
#error "Must define FW_JUMP_ADDR"
#endif