add simple prom emulator for MIPS

SVN-Revision: 13632

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