| /* |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License. See the file "COPYING" in the main directory of this archive |
| * for more details. |
| * |
| * Copyright (C) 2000 Silicon Graphics, Inc. |
| * Copyright (C) 2005 Ralf Baechle <ralf@linux-mips.org> |
| */ |
| #ifndef __ASM_MACH_IP27_KERNEL_ENTRY_H |
| #define __ASM_MACH_IP27_KERNEL_ENTRY_H |
| |
| #include <asm/sn/addrs.h> |
| #include <asm/sn/sn0/hubni.h> |
| #include <asm/sn/klkernvars.h> |
| |
| /* |
| * Returns the local nasid into res. |
| */ |
| .macro GET_NASID_ASM res |
| dli \res, LOCAL_HUB_ADDR(NI_STATUS_REV_ID) |
| ld \res, (\res) |
| and \res, NSRI_NODEID_MASK |
| dsrl \res, NSRI_NODEID_SHFT |
| .endm |
| |
| /* |
| * TLB bits |
| */ |
| #define PAGE_GLOBAL (1 << 6) |
| #define PAGE_VALID (1 << 7) |
| #define PAGE_DIRTY (1 << 8) |
| #define CACHE_CACHABLE_COW (5 << 9) |
| |
| /* |
| * inputs are the text nasid in t1, data nasid in t2. |
| */ |
| .macro MAPPED_KERNEL_SETUP_TLB |
| #ifdef CONFIG_MAPPED_KERNEL |
| /* |
| * This needs to read the nasid - assume 0 for now. |
| * Drop in 0xffffffffc0000000 in tlbhi, 0+VG in tlblo_0, |
| * 0+DVG in tlblo_1. |
| */ |
| dli t0, 0xffffffffc0000000 |
| dmtc0 t0, CP0_ENTRYHI |
| li t0, 0x1c000 # Offset of text into node memory |
| dsll t1, NASID_SHFT # Shift text nasid into place |
| dsll t2, NASID_SHFT # Same for data nasid |
| or t1, t1, t0 # Physical load address of kernel text |
| or t2, t2, t0 # Physical load address of kernel data |
| dsrl t1, 12 # 4K pfn |
| dsrl t2, 12 # 4K pfn |
| dsll t1, 6 # Get pfn into place |
| dsll t2, 6 # Get pfn into place |
| li t0, ((PAGE_GLOBAL | PAGE_VALID | CACHE_CACHABLE_COW) >> 6) |
| or t0, t0, t1 |
| mtc0 t0, CP0_ENTRYLO0 # physaddr, VG, cach exlwr |
| li t0, ((PAGE_GLOBAL | PAGE_VALID | PAGE_DIRTY | CACHE_CACHABLE_COW) >> 6) |
| or t0, t0, t2 |
| mtc0 t0, CP0_ENTRYLO1 # physaddr, DVG, cach exlwr |
| li t0, 0x1ffe000 # MAPPED_KERN_TLBMASK, TLBPGMASK_16M |
| mtc0 t0, CP0_PAGEMASK |
| li t0, 0 # KMAP_INX |
| mtc0 t0, CP0_INDEX |
| li t0, 1 |
| mtc0 t0, CP0_WIRED |
| tlbwi |
| #else |
| mtc0 zero, CP0_WIRED |
| #endif |
| .endm |
| |
| /* |
| * Intentionally empty macro, used in head.S. Override in |
| * arch/mips/mach-xxx/kernel-entry-init.h when necessary. |
| */ |
| .macro kernel_entry_setup |
| GET_NASID_ASM t1 |
| move t2, t1 # text and data are here |
| MAPPED_KERNEL_SETUP_TLB |
| .endm |
| |
| /* |
| * Do SMP slave processor setup necessary before we can savely execute C code. |
| */ |
| .macro smp_slave_setup |
| GET_NASID_ASM t1 |
| dli t0, KLDIR_OFFSET + (KLI_KERN_VARS * KLDIR_ENT_SIZE) + \ |
| KLDIR_OFF_POINTER + CAC_BASE |
| dsll t1, NASID_SHFT |
| or t0, t0, t1 |
| ld t0, 0(t0) # t0 points to kern_vars struct |
| lh t1, KV_RO_NASID_OFFSET(t0) |
| lh t2, KV_RW_NASID_OFFSET(t0) |
| MAPPED_KERNEL_SETUP_TLB |
| |
| /* |
| * We might not get launched at the address the kernel is linked to, |
| * so we jump there. |
| */ |
| PTR_LA t0, 0f |
| jr t0 |
| 0: |
| .endm |
| |
| #endif /* __ASM_MACH_IP27_KERNEL_ENTRY_H */ |
