Please note that diffs are not public domain; they are subject to the copyright notices on the relevant files. =================================================================== RCS file: /ftp/cvs/cvsroot/src/sys/arch/i386/i386/locore.S,v rcsdiff: /ftp/cvs/cvsroot/src/sys/arch/i386/i386/locore.S,v: warning: Unknown phrases like `commitid ...;' are present. retrieving revision 1.86 retrieving revision 1.113.2.1 diff -u -p -r1.86 -r1.113.2.1 --- src/sys/arch/i386/i386/locore.S 2009/03/21 22:55:08 1.86 +++ src/sys/arch/i386/i386/locore.S 2015/09/22 12:05:44 1.113.2.1 @@ -1,4 +1,4 @@ -/* $NetBSD: locore.S,v 1.86 2009/03/21 22:55:08 ad Exp $ */ +/* $NetBSD: locore.S,v 1.113.2.1 2015/09/22 12:05:44 skrll Exp $ */ /* * Copyright-o-rama! @@ -15,11 +15,6 @@ * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by Manuel Bouyer. - * 4. The name of the author may not be used to endorse or promote products - * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES @@ -134,9 +129,10 @@ */ #include -__KERNEL_RCSID(0, "$NetBSD: locore.S,v 1.86 2009/03/21 22:55:08 ad Exp $"); +__KERNEL_RCSID(0, "$NetBSD: locore.S,v 1.113.2.1 2015/09/22 12:05:44 skrll Exp $"); #include "opt_compat_oldboot.h" +#include "opt_copy_symtab.h" #include "opt_ddb.h" #include "opt_modular.h" #include "opt_multiboot.h" @@ -144,7 +140,6 @@ __KERNEL_RCSID(0, "$NetBSD: locore.S,v 1 #include "opt_vm86.h" #include "opt_xen.h" -#include "npx.h" #include "assym.h" #include "lapic.h" #include "ioapic.h" @@ -168,49 +163,46 @@ __KERNEL_RCSID(0, "$NetBSD: locore.S,v 1 /* Get definitions for IOM_BEGIN, IOM_END, and IOM_SIZE */ #include +#ifndef XEN +#define _RELOC(x) ((x) - KERNBASE) +#else +#define _RELOC(x) ((x)) +#endif /* XEN */ +#define RELOC(x) _RELOC(_C_LABEL(x)) + #ifdef XEN /* * Xen guest identifier and loader selection */ .section __xen_guest -#ifdef XEN3 .ascii "GUEST_OS=netbsd,GUEST_VER=3.0,XEN_VER=xen-3.0" -#if defined(DOM0OPS) || !defined(XEN_COMPAT_030001) - .ascii ",VIRT_BASE=0xc0000000" /* KERNBASE */ - .ascii ",ELF_PADDR_OFFSET=0xc0000000" /* KERNBASE */ -#else - .ascii ",VIRT_BASE=0xc0100000" /* KERNTEXTOFF */ - .ascii ",ELF_PADDR_OFFSET=0xc0100000" /* KERNTEXTOFF */ -#endif - .ascii ",VIRT_ENTRY=0xc0100000" /* KERNTEXTOFF */ -#if !defined(XEN_COMPAT_030001) - .ascii ",HYPERCALL_PAGE=0x00000101" + .ascii ",VIRT_BASE=0xc0000000" /* KERNBASE */ + .ascii ",ELF_PADDR_OFFSET=0xc0000000" /* KERNBASE */ + .ascii ",VIRT_ENTRY=0xc0100000" /* KERNTEXTOFF */ + .ascii ",HYPERCALL_PAGE=0x00000101" /* (???+HYPERCALL_PAGE_OFFSET)/PAGE_SIZE) */ -#endif #ifdef PAE - .ascii ",PAE=yes[extended-cr3]" + .ascii ",PAE=yes[extended-cr3]" #endif -#else /* !XEN3 */ - .ascii "GUEST_OS=netbsd,GUEST_VER=2.0,XEN_VER=2.0" -#endif /* XEN3 */ .ascii ",LOADER=generic" -#if (NKSYMS || defined(DDB) || defined(MODULAR)) && !defined(SYMTAB_SPACE) +#if (NKSYMS || defined(DDB) || defined(MODULAR)) && !defined(makeoptions_COPY_SYMTAB) .ascii ",BSD_SYMTAB=yes" #endif .byte 0 -#endif +#endif /* XEN */ /* * Initialization */ .data - .globl _C_LABEL(cpu) + .globl _C_LABEL(cputype) .globl _C_LABEL(cpuid_level) .globl _C_LABEL(esym) .globl _C_LABEL(eblob) .globl _C_LABEL(atdevbase) - .globl _C_LABEL(proc0uarea),_C_LABEL(PDPpaddr) + .globl _C_LABEL(lwp0uarea) + .globl _C_LABEL(PDPpaddr) .globl _C_LABEL(gdt) .globl _C_LABEL(idt) .globl _C_LABEL(lapic_tpr) @@ -222,47 +214,68 @@ __KERNEL_RCSID(0, "$NetBSD: locore.S,v 1 .align 12 #endif .globl _C_LABEL(local_apic), _C_LABEL(lapic_id) -_C_LABEL(local_apic): + .type _C_LABEL(local_apic), @object +LABEL(local_apic) .space LAPIC_ID -_C_LABEL(lapic_id): +END(local_apic) + .type _C_LABEL(lapic_id), @object +LABEL(lapic_id) .long 0x00000000 - .space LAPIC_TPRI-(LAPIC_ID+4) -_C_LABEL(lapic_tpr): - .space LAPIC_PPRI-LAPIC_TPRI + .space LAPIC_TPRI-(LAPIC_ID+4) +END(lapic_id) + .type _C_LABEL(lapic_tpr), @object +LABEL(lapic_tpr) + .space LAPIC_PPRI-LAPIC_TPRI +END(lapic_tpr) + .type _C_LABEL(lapic_ppr), @object _C_LABEL(lapic_ppr): .space LAPIC_ISR-LAPIC_PPRI +END(lapic_ppr) + .type _C_LABEL(lapic_isr), @object _C_LABEL(lapic_isr): .space PAGE_SIZE-LAPIC_ISR +END(lapic_isr) #else -_C_LABEL(lapic_tpr): + .type _C_LABEL(lapic_tpr), @object +LABEL(lapic_tpr) .long 0 +END(lapic_tpr) #endif - -_C_LABEL(cpu): .long 0 # are we 80486, Pentium, or.. -_C_LABEL(cpuid_level): .long 0 -_C_LABEL(atdevbase): .long 0 # location of start of iomem in virtual -_C_LABEL(proc0uarea): .long 0 -_C_LABEL(PDPpaddr): .long 0 # paddr of PDP, for libkvm + .type _C_LABEL(cputype), @object +LABEL(cputype) .long 0 # are we 80486, Pentium, or.. +END(cputype) + .type _C_LABEL(cpuid_level), @object +LABEL(cpuid_level) .long 0 +END(cpuid_level) + .type _C_LABEL(atdevbase), @object +LABEL(atdevbase) .long 0 # location of start of iomem in virtual +END(atdevbase) + .type _C_LABEL(lwp0uarea), @object +LABEL(lwp0uarea) .long 0 +END(lwp0uarea) + .type _C_LABEL(PDPpaddr), @object +LABEL(PDPpaddr) .long 0 # paddr of PDP, for libkvm +END(PDPpaddr) + .type _C_LABEL(tablesize), @object _C_LABEL(tablesize): .long 0 - +END(tablesize) + .size tmpstk, tmpstk - . .space 512 tmpstk: - -#ifndef XEN -#define _RELOC(x) ((x) - KERNBASE) -#else -#define _RELOC(x) ((x)) +#ifdef XEN + .align PAGE_SIZE, 0x0 # Align on page boundary +LABEL(tmpgdt) + .space PAGE_SIZE # Xen expects a page +END(tmpgdt) #endif /* XEN */ -#define RELOC(x) _RELOC(_C_LABEL(x)) .text .globl _C_LABEL(kernel_text) .set _C_LABEL(kernel_text),KERNTEXTOFF - .globl start +ENTRY(start) #ifndef XEN -start: movw $0x1234,0x472 # warm boot - + movw $0x1234,0x472 # warm boot #if defined(MULTIBOOT) jmp 1f @@ -350,11 +363,11 @@ isnx586: * Don't try cpuid, as Nx586s reportedly don't support the * PSL_ID bit. */ - movl $CPU_NX586,RELOC(cpu) + movl $CPU_NX586,RELOC(cputype) jmp 2f is386: - movl $CPU_386,RELOC(cpu) + movl $CPU_386,RELOC(cputype) jmp 2f try486: /* Try to toggle identification flag; does not exist on early 486s. */ @@ -373,7 +386,7 @@ try486: /* Try to toggle identification testl %eax,%eax jnz try586 -is486: movl $CPU_486,RELOC(cpu) +is486: movl $CPU_486,RELOC(cputype) /* * Check Cyrix CPU * Cyrix CPUs do not change the undefined flags following @@ -391,7 +404,7 @@ is486: movl $CPU_486,RELOC(cpu) popfl jmp 2f trycyrix486: - movl $CPU_6x86,RELOC(cpu) # set CPU type + movl $CPU_6x86,RELOC(cputype) # set CPU type /* * Check for Cyrix 486 CPU by seeing if the flags change during a * divide. This is documented in the Cx486SLC/e SMM Programmer's @@ -409,7 +422,7 @@ trycyrix486: xorl %ecx,%eax # are the flags different? testl $0x8d5,%eax # only check C|PF|AF|Z|N|V jne 2f # yes; must be Cyrix 6x86 CPU - movl $CPU_486DLC,RELOC(cpu) # set CPU type + movl $CPU_486DLC,RELOC(cputype) # set CPU type #ifndef CYRIX_CACHE_WORKS /* Disable caching of the ISA hole only. */ @@ -491,34 +504,48 @@ try586: /* Use the `cpuid' instruction. movl $_RELOC(tmpstk),%esp # bootstrap stack end location /* - * Virtual address space of kernel: + * Virtual address space of kernel, without PAE. The page dir is 1 page long. * * text | data | bss | [syms] | [blobs] | page dir | proc0 kstack | L1 ptp * 0 1 2 3 + * + * Virtual address space of kernel, with PAE. We need 4 pages for the page dir + * and 1 page for the L3. + * text | data | bss | [syms] | [blobs] | L3 | page dir | proc0 kstack | L1 ptp + * 0 1 5 6 7 */ - +#ifndef PAE #define PROC0_PDIR_OFF 0 -#define PROC0_STK_OFF (PROC0_PDIR_OFF + PAGE_SIZE) +#else +#define PROC0_L3_OFF 0 +#define PROC0_PDIR_OFF 1 * PAGE_SIZE +#endif + +#define PROC0_STK_OFF (PROC0_PDIR_OFF + PDP_SIZE * PAGE_SIZE) #define PROC0_PTP1_OFF (PROC0_STK_OFF + UPAGES * PAGE_SIZE) /* - * fillkpt + * fillkpt - Fill in a kernel page table * eax = pte (page frame | control | status) * ebx = page table address * ecx = number of pages to map + * + * For PAE, each entry is 8 bytes long: we must set the 4 upper bytes to 0. + * This is done by the first instruction of fillkpt. In the non-PAE case, this + * instruction just clears the page table entry. */ #define fillkpt \ -1: movl %eax,(%ebx) ; /* store phys addr */ \ - addl $4,%ebx ; /* next pte/pde */ \ - addl $PAGE_SIZE,%eax ; /* next phys page */ \ - loop 1b ; \ - +1: movl $0,(PDE_SIZE-4)(%ebx) ; /* clear bits */ \ + movl %eax,(%ebx) ; /* store phys addr */ \ + addl $PDE_SIZE,%ebx ; /* next pte/pde */ \ + addl $PAGE_SIZE,%eax ; /* next phys page */ \ + loop 1b ; /* Find end of kernel image. */ movl $RELOC(end),%edi -#if (NKSYMS || defined(DDB) || defined(MODULAR)) && !defined(SYMTAB_SPACE) +#if (NKSYMS || defined(DDB) || defined(MODULAR)) && !defined(makeoptions_COPY_SYMTAB) /* Save the symbols (if loaded). */ movl RELOC(esym),%eax testl %eax,%eax @@ -547,9 +574,14 @@ try586: /* Use the `cpuid' instruction. incl %eax /* one more ptp for VAs stolen by bootstrap */ 1: movl %eax,RELOC(nkptp)+1*4 - /* tablesize = (1 + UPAGES + nkptp) << PGSHIFT; */ - addl $(1+UPAGES),%eax + /* tablesize = (PDP_SIZE + UPAGES + nkptp) << PGSHIFT; */ + addl $(PDP_SIZE+UPAGES),%eax +#ifdef PAE + incl %eax /* one more page for the L3 PD */ + shll $PGSHIFT+1,%eax /* PTP tables are twice larger with PAE */ +#else shll $PGSHIFT,%eax +#endif movl %eax,RELOC(tablesize) /* ensure that nkptp covers bootstrap tables */ @@ -560,35 +592,38 @@ try586: /* Use the `cpuid' instruction. cmpl %eax,RELOC(nkptp)+1*4 jnz 1b - /* Clear tables */ - movl %esi,%edi + /* Clear tables */ + movl %esi,%edi xorl %eax,%eax cld - movl RELOC(tablesize),%ecx - shrl $2,%ecx + movl RELOC(tablesize),%ecx + shrl $2,%ecx rep stosl - leal (PROC0_PTP1_OFF)(%esi), %ebx + leal (PROC0_PTP1_OFF)(%esi), %ebx /* * Build initial page tables. */ - /* - * Compute &__data_start - KERNBASE. This can't be > 4G, + /* + * Compute &__data_start - KERNBASE. This can't be > 4G, * or we can't deal with it anyway, since we can't load it in * 32 bit mode. So use the bottom 32 bits. - */ - movl $RELOC(__data_start),%edx + */ + movl $RELOC(__data_start),%edx andl $~PGOFSET,%edx - /* - * Skip the first MB. - */ + /* + * Skip the first MB. + */ movl $_RELOC(KERNTEXTOFF),%eax movl %eax,%ecx - shrl $(PGSHIFT-2),%ecx /* ((n >> PGSHIFT) << 2) for # pdes */ - addl %ecx,%ebx + shrl $(PGSHIFT-2),%ecx /* ((n >> PGSHIFT) << 2) for # pdes */ +#ifdef PAE + shll $1,%ecx /* pdes are twice larger with PAE */ +#endif + addl %ecx,%ebx /* Map the kernel text read-only. */ movl %edx,%ecx @@ -613,59 +648,75 @@ try586: /* Use the `cpuid' instruction. /* * Construct a page table directory. */ - /* Set up top level entries for identity mapping */ - leal (PROC0_PDIR_OFF)(%esi),%ebx - leal (PROC0_PTP1_OFF)(%esi),%eax - orl $(PG_V|PG_KW), %eax - movl RELOC(nkptp)+1*4,%ecx + /* Set up top level entries for identity mapping */ + leal (PROC0_PDIR_OFF)(%esi),%ebx + leal (PROC0_PTP1_OFF)(%esi),%eax + orl $(PG_V|PG_KW), %eax + movl RELOC(nkptp)+1*4,%ecx fillkpt - /* Set up top level entries for actual kernel mapping */ - leal (PROC0_PDIR_OFF + L2_SLOT_KERNBASE*4)(%esi),%ebx - leal (PROC0_PTP1_OFF)(%esi),%eax - orl $(PG_V|PG_KW), %eax - movl RELOC(nkptp)+1*4,%ecx + /* Set up top level entries for actual kernel mapping */ + leal (PROC0_PDIR_OFF + L2_SLOT_KERNBASE*PDE_SIZE)(%esi),%ebx + leal (PROC0_PTP1_OFF)(%esi),%eax + orl $(PG_V|PG_KW), %eax + movl RELOC(nkptp)+1*4,%ecx fillkpt /* Install a PDE recursively mapping page directory as a page table! */ - leal (PROC0_PDIR_OFF + PDIR_SLOT_PTE*4)(%esi),%ebx - leal (PROC0_PDIR_OFF)(%esi),%eax - orl $(PG_V|PG_KW),%eax - movl %eax,(%ebx) - + leal (PROC0_PDIR_OFF + PDIR_SLOT_PTE*PDE_SIZE)(%esi),%ebx + leal (PROC0_PDIR_OFF)(%esi),%eax + orl $(PG_V|PG_KW),%eax + movl $PDP_SIZE,%ecx + fillkpt + +#ifdef PAE + /* Fill in proc0 L3 page with entries pointing to the page dirs */ + leal (PROC0_L3_OFF)(%esi),%ebx + leal (PROC0_PDIR_OFF)(%esi),%eax + orl $(PG_V),%eax + movl $PDP_SIZE,%ecx + fillkpt + + /* Enable PAE mode */ + movl %cr4,%eax + orl $CR4_PAE,%eax + movl %eax,%cr4 +#endif /* Save phys. addr of PDP, for libkvm. */ - movl %esi,RELOC(PDPpaddr) + leal (PROC0_PDIR_OFF)(%esi),%eax + movl %eax,RELOC(PDPpaddr) - /* - * Startup checklist: - * 1. Load %cr3 with pointer to PDIR. - */ + /* + * Startup checklist: + * 1. Load %cr3 with pointer to PDIR (or L3 PD page for PAE). + */ movl %esi,%eax # phys address of ptd in proc 0 movl %eax,%cr3 # load ptd addr into mmu - - /* - * 2. Enable paging and the rest of it. - */ + + /* + * 2. Enable paging and the rest of it. + */ movl %cr0,%eax # get control word - # enable paging & NPX emulation - orl $(CR0_PE|CR0_PG|CR0_NE|CR0_TS|CR0_EM|CR0_MP),%eax + # enable paging & NPX + orl $(CR0_PE|CR0_PG|CR0_NE|CR0_TS|CR0_MP|CR0_WP|CR0_AM),%eax movl %eax,%cr0 # and page NOW! pushl $begin # jump to high mem ret begin: - /* - * We have arrived. - * There's no need anymore for the identity mapping in low - * memory, remove it. - */ - movl _C_LABEL(nkptp)+1*4,%ecx - leal (PROC0_PDIR_OFF)(%esi),%ebx # old, phys address of PDIR - addl $(KERNBASE), %ebx # new, virtual address of PDIR -1: movl $0,(%ebx) - addl $4,%ebx + /* + * We have arrived. + * There's no need anymore for the identity mapping in low + * memory, remove it. + */ + movl _C_LABEL(nkptp)+1*4,%ecx + leal (PROC0_PDIR_OFF)(%esi),%ebx # old, phys address of PDIR + addl $(KERNBASE), %ebx # new, virtual address of PDIR +1: movl $0,(PDE_SIZE-4)(%ebx) # Upper bits (for PAE) + movl $0,(%ebx) + addl $PDE_SIZE,%ebx loop 1b /* Relocate atdevbase. */ @@ -675,11 +726,11 @@ begin: movl %edx,_C_LABEL(atdevbase) /* Set up bootstrap stack. */ - leal (PROC0_STK_OFF+KERNBASE)(%esi),%eax - movl %eax,_C_LABEL(proc0uarea) - leal (KSTACK_SIZE-FRAMESIZE)(%eax),%esp - movl %esi,(KSTACK_SIZE+PCB_CR3)(%eax) # pcb->pcb_cr3 - xorl %ebp,%ebp # mark end of frames + leal (PROC0_STK_OFF+KERNBASE)(%esi),%eax + movl %eax,_C_LABEL(lwp0uarea) + leal (USPACE-FRAMESIZE)(%eax),%esp + movl %esi,PCB_CR3(%eax) # pcb->pcb_cr3 + xorl %ebp,%ebp # mark end of frames #if defined(MULTIBOOT) /* It is now safe to parse the Multiboot information structure @@ -694,12 +745,16 @@ begin: call _C_LABEL(initgdt) addl $4,%esp - movl _C_LABEL(tablesize),%eax + movl _C_LABEL(tablesize),%eax addl %esi,%eax # skip past stack and page tables +#ifdef PAE + pushl $0 # init386() expects a 64 bits paddr_t with PAE +#endif pushl %eax call _C_LABEL(init386) # wire 386 chip for unix operation - addl $4+NGDT*8,%esp # pop temporary gdt + addl $PDE_SIZE,%esp # pop paddr_t + addl $NGDT*8,%esp # pop temporary gdt #ifdef SAFARI_FIFO_HACK movb $5,%al @@ -721,20 +776,15 @@ begin: call _C_LABEL(main) #else /* XEN */ -start: /* First, reset the PSL. */ pushl $PSL_MBO popfl cld -#ifdef XEN3 movl %esp, %ebx # save start of available space -#else - movl %esi,%ebx # save start_info pointer -#endif movl $_RELOC(tmpstk),%esp # bootstrap stack end location - /* Clear BSS first so that there are no surprises... */ + /* Clear BSS. */ xorl %eax,%eax movl $RELOC(__bss_start),%edi movl $RELOC(_end),%ecx @@ -742,7 +792,7 @@ start: rep stosb /* Copy the necessary stuff from start_info structure. */ - /* We need to copy shared_info early, so that sti/cli work */ + /* We need to copy shared_info early, so that sti/cli work */ movl $RELOC(start_info_union),%edi movl $128,%ecx rep movsl @@ -758,34 +808,47 @@ start: cpuid movl %eax,RELOC(cpuid_level) + /* + * Use a temp page. We'll re- add it to uvm(9) once we're + * done using it. + */ + movl $RELOC(tmpgdt), %eax + pushl %eax # start of temporary gdt + call _C_LABEL(initgdt) + addl $4,%esp + call xen_pmap_bootstrap + /* * First avail returned by xen_pmap_bootstrap in %eax */ movl %eax, %esi; - movl %esi, _C_LABEL(proc0uarea) - -#define PROC0PDIR ((0) * PAGE_SIZE) -#define PROC0STACK ((1) * PAGE_SIZE) + movl %esi, _C_LABEL(lwp0uarea) /* Set up bootstrap stack. */ - leal (KSTACK_SIZE-FRAMESIZE)(%eax),%esp - xorl %ebp,%ebp # mark end of frames + leal (USPACE-FRAMESIZE)(%eax),%esp + xorl %ebp,%ebp # mark end of frames addl $USPACE, %esi subl $KERNBASE, %esi #init386 want a physical address + +#ifdef PAE + pushl $0 # init386() expects a 64 bits paddr_t with PAE +#endif pushl %esi call _C_LABEL(init386) # wire 386 chip for unix operation - addl $4,%esp + addl $PDE_SIZE,%esp # pop paddr_t call _C_LABEL(main) +#endif /* XEN */ +END(start) -#if defined(XEN3) && !defined(XEN_COMPAT_030001) +#if defined(XEN) /* space for the hypercall call page */ #define HYPERCALL_PAGE_OFFSET 0x1000 .org HYPERCALL_PAGE_OFFSET ENTRY(hypercall_page) .skip 0x1000 -#endif /* defined(XEN3) && !defined(XEN_COMPAT_030001) */ +END(hypercall_page) /* * void lgdt_finish(void); @@ -818,8 +881,9 @@ END(lgdt_finish) * * This is a trampoline function pushed onto the stack of a newly created * process in order to do some additional setup. The trampoline is entered by - * cpu_switch()ing to the process, so we abuse the callee-saved registers used - * by cpu_switch() to store the information about the stub to call. + * cpu_switchto()ing to the process, so we abuse the callee-saved + * registers used by cpu_switchto() to store the information about the + * stub to call. * NOTE: This function does not have a normal calling sequence! */ NENTRY(lwp_trampoline) @@ -911,7 +975,7 @@ ENTRY(dumpsys) END(dumpsys) /* - * struct lwp *cpu_switchto(struct lwp *oldlwp, struct *newlwp, + * struct lwp *cpu_switchto(struct lwp *oldlwp, struct lwp *newlwp, * bool returning) * * 1. if (oldlwp != NULL), save its context. @@ -944,12 +1008,12 @@ ENTRY(cpu_switchto) jz 1f /* Save old context. */ - movl L_ADDR(%esi),%eax + movl L_PCB(%esi),%eax movl %esp,PCB_ESP(%eax) movl %ebp,PCB_EBP(%eax) /* Switch to newlwp's stack. */ -1: movl L_ADDR(%edi),%ebx +1: movl L_PCB(%edi),%ebx movl PCB_EBP(%ebx),%ebp movl PCB_ESP(%ebx),%esp @@ -968,15 +1032,17 @@ ENTRY(cpu_switchto) pushl %edi call _C_LABEL(i386_switch_context) addl $4,%esp -#else /* XEN */ +#else /* !XEN */ /* Switch ring0 esp */ movl PCB_ESP0(%ebx),%eax movl %eax,CPUVAR(ESP0) +#endif /* !XEN */ /* Don't bother with the rest if switching to a system process. */ testl $LW_SYSTEM,L_FLAG(%edi) jnz 4f +#ifndef XEN /* Restore thread-private %fs/%gs descriptors. */ movl CPUVAR(GDT),%ecx movl PCB_FSD(%ebx), %eax @@ -987,12 +1053,12 @@ ENTRY(cpu_switchto) movl PCB_GSD+4(%ebx), %edx movl %eax, (GUGS_SEL*8)(%ecx) movl %edx, (GUGS_SEL*8+4)(%ecx) -#endif /* XEN */ +#endif /* !XEN */ /* Switch I/O bitmap */ movl PCB_IOMAP(%ebx),%eax orl %eax,%eax - jnz,pn .Lcopy_iobitmap + jnz .Lcopy_iobitmap movl $(IOMAP_INVALOFF << 16),CPUVAR(IOBASE) .Liobitmap_done: @@ -1002,13 +1068,17 @@ ENTRY(cpu_switchto) jne 5f /* - * Restore cr0 (including FPU state). Raise the IPL to IPL_IPI. + * Restore cr0 (including FPU state). Raise the IPL to IPL_HIGH. * FPU IPIs can alter the LWP's saved cr0. Dropping the priority * is deferred until mi_switch(), when cpu_switchto() returns. */ 2: -#ifndef XEN - movl $IPL_IPI,CPUVAR(ILEVEL) +#ifdef XEN + pushl %edi + call _C_LABEL(i386_tls_switch) + addl $4,%esp +#else /* !XEN */ + movl $IPL_HIGH,CPUVAR(ILEVEL) movl PCB_CR0(%ebx),%ecx /* has CR0_TS clear */ movl %cr0,%edx @@ -1024,7 +1094,7 @@ ENTRY(cpu_switchto) 3: cmpl %edx,%ecx je 4f movl %ecx,%cr0 -#endif /* XEN */ +#endif /* !XEN */ /* Return to the new LWP, returning 'oldlwp' in %eax. */ 4: movl %esi,%eax @@ -1080,10 +1150,13 @@ END(savectx) * Old call gate entry for syscall */ IDTVEC(osyscall) +#ifndef XEN + /* XXX we are in trouble! interrupts be off here. */ cli # must be first instruction +#endif pushfl # set eflags in trap frame popl 8(%esp) - orl $PSL_I,(%esp) # re-enable ints on return to user + orl $PSL_I,8(%esp) # re-enable ints on return to user pushl $7 # size of instruction for restart jmp syscall1 IDTVEC_END(osyscall) @@ -1111,7 +1184,8 @@ syscall1: #endif 1: #endif /* DIAGNOSTIC */ - incl CPUVAR(NSYSCALL) # count it atomically + addl $1,CPUVAR(NSYSCALL) # count it atomically + adcl $0,CPUVAR(NSYSCALL)+4 # count it atomically movl CPUVAR(CURLWP),%edi movl L_PROC(%edi),%edx movl %esp,L_MD_REGS(%edi) # save pointer to frame @@ -1137,13 +1211,13 @@ syscall1: .Lsyscall_resume: movl %ebx,%eax # get cpl movl CPUVAR(IUNMASK)(,%eax,4),%eax - andl CPUVAR(IPENDING),%eax # any non-masked bits left? + andl CPUVAR(IPENDING),%eax # any non-masked bits left? jz 17f bsrl %eax,%eax btrl %eax,CPUVAR(IPENDING) movl CPUVAR(ISOURCES)(,%eax,4),%eax jmp *IS_RESUME(%eax) -17: movl %ebx, CPUVAR(ILEVEL) #restore cpl +17: movl %ebx, CPUVAR(ILEVEL) #restore cpl jmp .Lsyscall_checkast 14: #endif /* XEN */ @@ -1214,41 +1288,10 @@ IDTVEC(svr4_fasttrap) cli jmp 2b -#if NNPX > 0 -/* - * Special interrupt handlers. Someday intr0-intr15 will be used to count - * interrupts. We'll still need a special exception 16 handler. The busy - * latch stuff in probintr() can be moved to npxprobe(). - */ - -/* - * void probeintr(void) - */ -NENTRY(probeintr) - ss - incl _C_LABEL(npx_intrs_while_probing) - pushl %eax - movb $0x20,%al # EOI (asm in strings loses cpp features) - outb %al,$0xa0 # IO_ICU2 - outb %al,$0x20 # IO_ICU1 - movb $0,%al - outb %al,$0xf0 # clear BUSY# latch - popl %eax - iret -END(probeintr) - -/* - * void probetrap(void) - */ -NENTRY(probetrap) - ss - incl _C_LABEL(npx_traps_while_probing) - fnclex - iret -END(probetrap) - /* * int npx586bug1(int a, int b) + * Used when checking for the FDIV bug on first generations pentiums. + * Anything 120MHz or above is fine. */ NENTRY(npx586bug1) fildl 4(%esp) # x @@ -1262,7 +1305,6 @@ NENTRY(npx586bug1) popl %eax ret END(npx586bug1) -#endif /* NNPX > 0 */ /* * void sse2_idlezero_page(void *pg)