[kernel] add simple prom emulator for MIPS

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@13632 3c298f89-4303-0410-b956-a3cf2f4a3e73
2008-12-14 20:17:20 +00:00 · 2008-12-14 20:17:20 +00:00 · ee6f794099
parent 8e23f40be7
commit ee6f794099
1 changed files with 50 additions and 0 deletions
--- a/target/linux/generic-2.6/patches-2.6.26/021-mips_simple_prom_emulator.patch
+++ b/target/linux/generic-2.6/patches-2.6.26/021-mips_simple_prom_emulator.patch
@ -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