2 * Copyright (c) 2003 Peter Wemm <peter@FreeBSD.org>
3 * Copyright (c) 2011-2012 Spectra Logic Corporation
4 * Copyright (c) 2013 Roger Pau Monne <royger@FreeBSD.org>
7 * This software was developed by Cherry G. Mathew <cherry@zyx.in>
8 * under sponsorship from Spectra Logic Corporation.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include <machine/asmacros.h>
35 #include <machine/psl.h>
36 #include <machine/pmap.h>
37 #include <machine/specialreg.h>
39 #include <xen/xen-os.h>
41 #include <xen/interface/elfnote.h>
45 #define VTOP(x) ((x) - KERNBASE)
46 #define ENTRY_SIZE 8 /* sizeof(uint64_t) */
52 ELFNOTE(Xen, XEN_ELFNOTE_GUEST_OS, .asciz, "FreeBSD")
53 ELFNOTE(Xen, XEN_ELFNOTE_GUEST_VERSION, .asciz, __XSTRING(__FreeBSD_version))
54 ELFNOTE(Xen, XEN_ELFNOTE_XEN_VERSION, .asciz, "xen-3.0")
55 ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE, .quad, KERNBASE)
56 ELFNOTE(Xen, XEN_ELFNOTE_PADDR_OFFSET, .quad, 0)
57 ELFNOTE(Xen, XEN_ELFNOTE_ENTRY, .quad, xen_start)
58 ELFNOTE(Xen, XEN_ELFNOTE_HYPERCALL_PAGE, .quad, hypercall_page)
59 ELFNOTE(Xen, XEN_ELFNOTE_HV_START_LOW, .quad, HYPERVISOR_VIRT_START)
60 ELFNOTE(Xen, XEN_ELFNOTE_FEATURES, .asciz, "writable_descriptor_tables|auto_translated_physmap|supervisor_mode_kernel|hvm_callback_vector")
61 ELFNOTE(Xen, XEN_ELFNOTE_PAE_MODE, .asciz, "yes")
62 ELFNOTE(Xen, XEN_ELFNOTE_L1_MFN_VALID, .long, PG_V, PG_V)
63 ELFNOTE(Xen, XEN_ELFNOTE_LOADER, .asciz, "generic")
64 ELFNOTE(Xen, XEN_ELFNOTE_SUSPEND_CANCEL, .long, 0)
65 ELFNOTE(Xen, XEN_ELFNOTE_BSD_SYMTAB, .asciz, "yes")
66 /* For PVHv2 support. */
67 ELFNOTE(Xen, XEN_ELFNOTE_PHYS32_ENTRY, .long, VTOP(xen_start32))
70 .p2align PAGE_SHIFT, 0x90 /* Hypercall_page needs to be PAGE aligned */
72 NON_GPROF_ENTRY(hypercall_page)
73 .skip 0x1000, 0x90 /* Fill with "nop"s */
75 /* Legacy PVH entry point, to be removed. */
76 NON_GPROF_ENTRY(xen_start)
77 /* Don't trust what the loader gives for rflags. */
81 /* Parameters for the xen init function */
82 movq %rsi, %rdi /* shared_info (arg 1) */
83 movq %rsp, %rsi /* xenstack (arg 2) */
85 /* Use our own stack */
89 /* u_int64_t hammer_time_xen(start_info_t *si, u_int64_t xenstack); */
90 call hammer_time_xen_legacy
91 movq %rax, %rsp /* set up kstack for mi_startup() */
92 call mi_startup /* autoconfiguration, mountroot etc */
98 /* PVH entry point. */
100 NON_GPROF_ENTRY(xen_start32)
103 movl $VTOP(gdtdesc32), %eax
105 jmp $GDT_CODE, $VTOP(reload_cs)
113 movl $VTOP(bootstack), %esp
115 /* Don't trust what the loader gives for eflags. */
120 * Create the page tables.
121 * The first 1GB is mapped using 2MB entries.
125 cmp $(PAGE_SIZE/ENTRY_SIZE), %eax
128 /* PT4[i] = VTOP(&PT3[0]) | PG_V | PG_RW | PG_U */
129 movl $VTOP(PT4), %ecx
130 movl $VTOP(PT3), %edx
131 orl $(PG_V | PG_RW | PG_U), %edx
132 movl %edx, (%ecx,%eax,ENTRY_SIZE)
134 /* PT3[i] = VTOP(&PT2[0]) | PG_V | PG_RW | PG_U */
135 movl $VTOP(PT3), %ecx
136 movl $VTOP(PT2), %edx
137 orl $(PG_V | PG_RW | PG_U), %edx
138 movl %edx, (%ecx,%eax,ENTRY_SIZE)
140 /* PT2[i] = i * 2MiB | PG_V | PG_RW | PG_PS | PG_U */
141 movl $VTOP(PT2), %ecx
144 orl $(PG_V | PG_RW | PG_PS | PG_U), %edx
145 movl %edx, (%ecx,%eax,ENTRY_SIZE)
151 /* Turn on EFER.LME */
162 /* Set %cr3 for PT4 */
163 movl $VTOP(PT4), %eax
166 /* Turn on paging (implicitly sets EFER.LMA) */
171 /* Now we're in compatibility mode. Set %cs for long mode */
172 movl $VTOP(gdtdesc), %eax
174 ljmp $GDT_CODE, $VTOP(longmode)
178 /* We're still running V=P, jump to entry point */
179 movq $bootstack, %rsp
180 movq $start_kernel, %rax
186 * Pass %ebx as the argument to hammer_time_xen, it contains
198 /* Space for initial page tables */
210 .word gdtend - gdt - 1
211 .long VTOP(gdt) # low
214 .long 0 # null descriptor
216 .long 0x00000000 # %cs
218 .long 0x00000000 # %ds
224 .word gdt32end - gdt32 - 1
228 .long 0 # null descriptor
230 .long 0x0000ffff # %cs
232 .long 0x0000ffff # %ds, %es, %ss