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Adjust bootstrap code to build kernels that work with the mailbox test app.

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--HG--
branch : dtrg-videocore
This commit is contained in:
David Given 2013-05-22 00:16:59 +01:00
parent f904465e9c
commit 72542288cd
1 changed files with 38 additions and 12 deletions

50
plat/rpi/boot.s
View file

@ -15,27 +15,47 @@
.sect .text .sect .text
#define gp r15
begtext: begtext:
lea r15, begtext ! Set up system registers.
lea gp, begtext
st sp, .returnsp st sp, .returnsp
st lr, .returnlr st lr, .returnlr
#if 0 ! The GPU kernel code will load parameters into r0-r5. Save them
! so that the user code can access them.
sub r0, gp ! pointer
sub r1, gp ! pointer
sub r2, gp ! pointer
sub r3, gp ! pointer
! r4-r5 are not pointers and don't need adjusting
push r0-r5
sub r0, sp, gp
st r0, _gpu_parameters
! Wipe the bss. (I'm a little suprised that __m_a_i_n doesn't do this.) ! Wipe the bss. (I'm a little suprised that __m_a_i_n doesn't do this.)
mov di, begbss lea r0, begbss
mov cx, endbss lea r1, endbss
sub cx, di mov r2, #0
mov ax, 0 _1:
rep stosb stb r2, (r0)
addcmpb.lt r2, #1, r1, _1
! Push standard parameters onto the stack and go. ! Push standard parameters onto the stack and go.
push envp ! envp mov r0, #0
push argv ! argv push r0 ! envp
push 1 ! argc push r0 ! argv
#endif push r0 ! argc
b __m_a_i_n
! Call the language startup code.
bl __m_a_i_n
! Fall through to __exit if this returns.
.define __exit .define __exit
__exit: __exit:
@ -63,3 +83,9 @@ __exit:
.comm .returnsp, 4 .comm .returnsp, 4
.comm .returnlr, 4 .comm .returnlr, 4
! User pointer to the GPU kernel parameter block.
.define _gpu_parameters
.comm _gpu_parameters, 4