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[kernel] add simple prom emulator for MIPS

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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@13632 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
juhosg 2008-12-14 20:17:20 +00:00
parent ba4c39d9c4
commit 0a897fc137
1 changed files with 50 additions and 0 deletions
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50
target/linux/generic-2.6/patches-2.6.26/021-mips_simple_prom_emulator.patch Normal file
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@ -0,0 +1,50 @@
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -860,6 +860,9 @@ config SYNC_R4K
config MIPS_MACHINE
def_bool n
+
+config PROM_EMU
+ def_bool n
config NO_IOPORT
def_bool n
--- a/arch/mips/kernel/head.S
+++ b/arch/mips/kernel/head.S
@@ -142,6 +142,15 @@ FEXPORT(__kernel_entry)
j kernel_entry
#endif
+#ifdef CONFIG_PROM_EMU
+EXPORT(prom_emu_argv)
+ .dw 0
+ .dw prom_emu_cmdline
+ .ascii "CMDLINE:"
+EXPORT(prom_emu_cmdline)
+ .fill 0x400
+#endif
+
__REF
NESTED(kernel_entry, 16, sp) # kernel entry point
@@ -182,6 +191,19 @@ NESTED(kernel_entry, 16, sp) # kernel
LONG_S zero, (t0)
bne t0, t1, 1b
+#ifdef CONFIG_PROM_EMU
+ PTR_LA t0, prom_emu_cmdline
+ LONG_L t1, 0(t0)
+ beqz t1, 1f
+
+ li a0, 2
+ PTR_LA a1, prom_emu_argv
+ move a2, zero
+ move a3, zero
+
+1:
+#endif /* CONFIG_PROM_EMU */
+
LONG_S a0, fw_arg0 # firmware arguments
LONG_S a1, fw_arg1
LONG_S a2, fw_arg2