Differential D22255 Diff 64104 sys/arm64/arm64/locore.S

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sys/arm64/arm64/locore.S

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* D-Cache: off		* D-Cache: off
* I-Cache: on or off		* I-Cache: on or off
* We are loaded at a 2MiB aligned address		* We are loaded at a 2MiB aligned address
*/		*/

.text		.text
.globl _start		.globl _start
_start:		_start:
		#ifdef LINUX_BOOT_ABI
		/*
		* See Documentation/arm64/booting.txt in the Linux kernel.
		* This is needed to boot using U-Boot's booti command.
		*/

		#define BOOTI_MAGIC 0x644d5241
		#define UBOOT_IMAGE_OFFSET 0
		#define UBOOT_IMAGE_SIZE _end - _start
		#define UBOOT_IMAGE_FLAGS 0

		b 1f /* Executable code */
		.long 0 /* Executable code */
		.quad UBOOT_IMAGE_OFFSET /* Image load offset, little endian */
		.quad UBOOT_IMAGE_SIZE /* Effective Image size, little endian */
		.quad UBOOT_IMAGE_FLAGS /* kernel flags, little endian */
		.quad 0 /* reserved */
		.quad 0 /* reserved */
		.quad 0 /* reserved */
		.long BOOTI_MAGIC /* Magic number, little endian, "ARM\x64" */
		.long 0 /* reserved (used for PE COFF offset) */
		1:
		#endif
/* Drop to EL1 */		/* Drop to EL1 */
bl drop_to_el1		bl drop_to_el1

/*		/*
* Disable the MMU. We may have entered the kernel with it on and		* Disable the MMU. We may have entered the kernel with it on and
* will need to update the tables later. If this has been set up		* will need to update the tables later. If this has been set up
* with anything other than a VA == PA map then this will fail,		* with anything other than a VA == PA map then this will fail,
* but in this case the code to find where we are running from		* but in this case the code to find where we are running from
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stp xzr, xzr, [x6], #16		stp xzr, xzr, [x6], #16
cmp x6, x27		cmp x6, x27
b.lo 1b		b.lo 1b

/*		/*
* Build the TTBR1 maps.		* Build the TTBR1 maps.
*/		*/

/* Find the size of the kernel */
mov x6, #(KERNBASE)		mov x6, #(KERNBASE)
/* Find modulep - begin */		and x7, x0, x6
sub x8, x0, x6		cmp x7, x6
		b.eq 1f
		/* booted from U-Boot */
		ldr x7, .Lend
		sub x8, x7, x6 /* kernel size = end - begin */
		b 2f
		1:
		/* booted from FreeBSD loader */
		sub x8, x0, x6 /* size = modulep - begin */
/* Add two 2MiB pages for the module data and round up */		/* Add two 2MiB pages for the module data and round up */
ldr x7, =(3 * L2_SIZE - 1)		ldr x7, =(3 * L2_SIZE - 1)
add x8, x8, x7		add x8, x8, x7
		2:
/* Get the number of l2 pages to allocate, rounded down */		/* Get the number of l2 pages to allocate, rounded down */
lsr x10, x8, #(L2_SHIFT)		lsr x10, x8, #(L2_SHIFT)
		/* Add 1 to get actual count */
		add x10, x10, #1

/* Create the kernel space L2 table */		/* Create the kernel space L2 table */
mov x6, x26		mov x6, x26
mov x7, #NORMAL_MEM		mov x7, #NORMAL_MEM
mov x8, #(KERNBASE & L2_BLOCK_MASK)		mov x8, #(KERNBASE & L2_BLOCK_MASK)
mov x9, x28		mov x9, x28
bl build_l2_block_pagetable		bl build_l2_block_pagetable

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