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microblaze: Fix bug with passing command line

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When u-boot passes control over to Linux it places the Linux command
line between to the end of __init_end. When space between
__init_end and __bss_start is not COMMAND_LINE_SIZE then
the part of cmdline can be lost.
In extreme case if __init_end == __bss_start u-boot can't pass
any cmdline to Linux kernel.

This patch fix this issue by copying cmd line directly to
cmd_line char array which is placed in data section.

Reported-by: David Mc Andrew <david.mcandrew@xilinx.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>
This commit is contained in:
Michal Simek
2012-08-16 15:53:35 +02:00
parent c7e9a211e2
commit fcc1c0ff25
2 changed files with 15 additions and 12 deletions
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14
arch/microblaze/kernel/head.S
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@@ -109,20 +109,24 @@ no_fdt_arg:
#ifndef CONFIG_CMDLINE_BOOL
/*
* handling command line
* copy command line to __init_end. There is space for storing command line.
* copy command line directly to cmd_line placed in data section.
*/
beqid r5, skip /* Skip if NULL pointer */
or r6, r0, r0 /* incremment */
ori r4, r0, __init_end /* load address of command line */
ori r4, r0, cmd_line /* load address of command line */
tophys(r4,r4) /* convert to phys address */
ori r3, r0, COMMAND_LINE_SIZE - 1 /* number of loops */
_copy_command_line:
lbu r2, r5, r6 /* r2=r5+r6 - r5 contain pointer to command line */
sb r2, r4, r6 /* addr[r4+r6]= r2*/
/* r2=r5+r6 - r5 contain pointer to command line */
lbu r2, r5, r6
beqid r2, skip /* Skip if no data */
sb r2, r4, r6 /* addr[r4+r6]= r2*/
addik r6, r6, 1 /* increment counting */
bgtid r3, _copy_command_line /* loop for all entries */
addik r3, r3, -1 /* descrement loop */
addik r3, r3, -1 /* decrement loop */
addik r5, r4, 0 /* add new space for command line */
tovirt(r5,r5)
skip:
#endif /* CONFIG_CMDLINE_BOOL */
#ifdef NOT_COMPILE