sparc/kernel/head_32.S

1 /* SPDX-License-Identifier: GPL-2.0 */
19 #include <asm/asi.h>
31 /* The following are used with the prom_vector node-ops to figure out
32  * the cpu-type
40 /* Tested on SS-5, SS-10 */
48 	.asciz	"Sparc-Linux sun4/sun4c or MMU-less not supported\n\n"
52         .asciz  "Sparc-Linux sun4e support does not exist\n\n"
55 /* The trap-table - located in the __HEAD section */
61  * these page-table data structures.
101 		 * memory.  The Solaris /boot elf format bootloader
103 		 * we want to be, otherwise we have to re-map.
106 		 * in %o7, so we do a pc-relative call to a local
204 		 * LEON - identified by the psr.impl field
205 		 * Viking - identified by the psr.impl field
215 		be	leon_remap		/* It is a LEON - jump */
218 		/* Sanity-check, is MMU enabled */
264 		 * on the sun4m is in some ASI space...
276 		add	%o1, KERNBASE >> (PGDIR_SHIFT - 2), %o3
285 		 * for ABI compliance anyways?  Does this low-mapping provide
300 		/* Wow, all that just to move a 32-bit value from one
320 		add	%g1, KERNBASE >> (PGDIR_SHIFT - 2), %g3
327 		/* Sanity-check, is MMU enabled */
334 		 * with the LEON ASI for mmuregs
344 		add	%g1, KERNBASE >> (PGDIR_SHIFT - 2), %g3
349 /* Now do a non-relative jump so that PC is in high-memory */
382 		sethi	%hi(cputypvar), %o1	! First node has cpu-arch
428 		/* LEON CPU - set boot_cpu_id */
429 		sethi	%hi(boot_cpu_id), %g2	! boot-cpu index
437 		/* Get CPU-ID from most significant 4-bit of ASR17 */
492 		/* Fujitsu MicroSPARC-II has no asynchronous flavors of FARs */
507  * show-time!
518 		set	(THREAD_SIZE - STACKFRAME_SZ - TRACEREG_SZ), %g2
533 		 * init-code above we default it to zero.
655 		/* Finally, turn on traps so that we can call c-code. */
718 		.word	0, 0, sun4u_6, 0, sun4u_6e - sun4u_6 - 1, 0
735 		mov	sun4u_r4 - sun4u_a1, %l3
742 		 st	%l5, [%l4 - 4]
751 		ld	[%l1 + (sun4u_r1 - sun4u_a1)], %o1
752 		add	%l1, (sun4u_a2 - sun4u_a1), %o0
754 		 st	%o1, [%o0 + (sun4u_i2 - sun4u_a2)]
756 		ld	[%l1 + (sun4u_1 - sun4u_a1)], %o1
757 		add	%l1, (sun4u_a3 - sun4u_a1), %o0
759 		st	%o1, [%o0 + (sun4u_i3 - sun4u_a3)]
762 		 add	%l1, (sun4u_a4 - sun4u_a1), %o0
778  * gets initialized in c-code so all routines can use it.