Commit 15f37e15 authored by Jonas Gorski's avatar Jonas Gorski Committed by Ralf Baechle
Browse files

MIPS: store the appended dtb address in a variable 



Instead of rewriting the arguments to match the UHI spec, store the
address of a appended or UHI supplied dtb in fw_supplied_dtb.

That way the original bootloader arugments are kept intact while still
making the use of an appended dtb invisible for mach code.

Mach code can still find out if it is an appended dtb by comparing
fw_arg1 with fw_supplied_dtb.

Signed-off-by: default avatarJonas Gorski <jogo@openwrt.org>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: John Crispin <john@phrozen.org>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Alban Bedel <albeu@free.fr>
Cc: Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>
Cc: Antony Pavlov <antonynpavlov@gmail.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/13699/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent b8f54f2c

arch/mips/ath79/setup.c

+2 −2
Original line number Diff line number Diff line
@@ -204,8 +204,8 @@ void __init plat_mem_setup(void) 
	fdt_start = fw_getenvl("fdt_start");

	if (fdt_start)

		__dt_setup_arch((void *)KSEG0ADDR(fdt_start));

	else if (fw_arg0 == -2)

		__dt_setup_arch((void *)KSEG0ADDR(fw_arg1));

	else if (fw_passed_dtb)

		__dt_setup_arch((void *)KSEG0ADDR(fw_passed_dtb));



	if (mips_machtype != ATH79_MACH_GENERIC_OF) {

		ath79_reset_base = ioremap_nocache(AR71XX_RESET_BASE,

arch/mips/bmips/setup.c

+2 −2
Original line number Diff line number Diff line
@@ -162,8 +162,8 @@ void __init plat_mem_setup(void) 
	/* intended to somewhat resemble ARM; see Documentation/arm/Booting */

	if (fw_arg0 == 0 && fw_arg1 == 0xffffffff)

		dtb = phys_to_virt(fw_arg2);

	else if (fw_arg0 == -2) /* UHI interface */

		dtb = (void *)fw_arg1;

	else if (fw_passed_dtb) /* UHI interface */

		dtb = (void *)fw_passed_dtb;

	else if (__dtb_start != __dtb_end)

		dtb = (void *)__dtb_start;

	else

arch/mips/include/asm/bootinfo.h

+4 −0
Original line number Diff line number Diff line
@@ -127,6 +127,10 @@ extern char arcs_cmdline[COMMAND_LINE_SIZE]; 
 */

extern unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;



#ifdef CONFIG_USE_OF

extern unsigned long fw_passed_dtb;

#endif



/*

 * Platform memory detection hook called by setup_arch

 */

arch/mips/kernel/head.S

+14 −7
Original line number Diff line number Diff line
@@ -93,21 +93,24 @@ NESTED(kernel_entry, 16, sp) # kernel entry point 
	jr	t0

0:



#ifdef CONFIG_USE_OF

#ifdef CONFIG_MIPS_RAW_APPENDED_DTB

	PTR_LA		t0, __appended_dtb

	PTR_LA		t2, __appended_dtb



#ifdef CONFIG_CPU_BIG_ENDIAN

	li		t1, 0xd00dfeed

#else

	li		t1, 0xedfe0dd0

#endif

	lw		t2, (t0)

	bne		t1, t2, not_found

	 nop

	lw		t0, (t2)

	beq		t0, t1, dtb_found

#endif

	li		t1, -2

	beq		a0, t1, dtb_found

	move		t2, a1



	move		a1, t0

	PTR_LI		a0, -2

not_found:

	li		t2, 0

dtb_found:

#endif

	PTR_LA		t0, __bss_start		# clear .bss

	LONG_S		zero, (t0)
@@ -122,6 +125,10 @@ not_found: 
	LONG_S		a2, fw_arg2

	LONG_S		a3, fw_arg3



#ifdef CONFIG_USE_OF

	LONG_S		t2, fw_passed_dtb

#endif



	MTC0		zero, CP0_CONTEXT	# clear context register

	PTR_LA		$28, init_thread_union

	/* Set the SP after an empty pt_regs.  */

arch/mips/kernel/setup.c

+4 −0
Original line number Diff line number Diff line
@@ -875,6 +875,10 @@ void __init setup_arch(char **cmdline_p) 
unsigned long kernelsp[NR_CPUS];

unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;



#ifdef CONFIG_USE_OF

unsigned long fw_passed_dtb;

#endif



#ifdef CONFIG_DEBUG_FS

struct dentry *mips_debugfs_dir;

static int __init debugfs_mips(void)

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