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