/* * 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 safely 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 */