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24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | # |
27 | # |
28 | 28 | ||
29 | .section K_TEXT_START |
- | |
30 | .global kernel_image_start |
29 | #include <arch/mm/ptl.h> |
31 | 30 | ||
- | 31 | #define START_STACK 0x7c00 |
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- | 32 | #define START_STACK_64 $0xffffffff80007c00 |
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32 | .code16 |
33 | |
33 | # |
34 | # |
34 | # This is where we require any SPARTAN-kernel-compatible boot loader |
35 | # This is where we require any SPARTAN-kernel-compatible boot loader |
35 | # to pass control in real mode. |
36 | # to pass control in real mode. |
36 | # |
37 | # |
37 | # Protected mode tables are statically initialised during compile |
38 | # Protected mode tables are statically initialised during compile |
38 | # time. So we can just load the respective table registers and |
39 | # time. So we can just load the respective table registers and |
39 | # switch to protected mode. |
40 | # switch to protected mode. |
40 | # |
41 | # |
- | 42 | .section K_TEXT_START |
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- | 43 | .code16 |
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- | 44 | .global kernel_image_start |
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41 | kernel_image_start: |
45 | kernel_image_start: |
42 | cli |
46 | cli |
43 | xorw %ax,%ax |
47 | xorw %ax,%ax |
44 | movw %ax,%ds |
48 | movw %ax,%ds |
45 | movw %ax,%ss # initialize stack segment register |
49 | movw %ax,%ss # initialize stack segment register |
46 | movl $0x7c00,%esp # initialize stack pointer |
50 | movl START_STACK,%esp # initialize stack pointer |
47 | 51 | ||
48 | call memmap_arch_init |
52 | # call memmap_arch_init |
49 | 53 | ||
50 | mov $0x80000000, %eax |
54 | mov $0x80000000, %eax |
51 | cpuid |
55 | cpuid |
52 | cmp $0x80000000, %eax # any function > 80000000h? |
56 | cmp $0x80000000, %eax # any function > 80000000h? |
53 | jbe no_long_mode |
57 | jbe no_long_mode |
54 | mov $0x80000001, %eax # Extended function code 80000001 |
58 | mov $0x80000001, %eax # Extended function code 80000001 |
55 | cpuid |
59 | cpuid |
56 | bt $29, %edx # Test if long mode is supported. |
60 | bt $29, %edx # Test if long mode is supported. |
57 | jnc no_long_mode |
61 | jnc no_long_mode |
58 | 62 | ||
59 | # Fill out GDTR.base, IDTR.base |
63 | # Load gdtr, idtr |
60 | leal gdtr, %eax |
64 | lgdt gdtr_inst |
- | 65 | lidt idtr_inst |
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- | 66 | ||
61 | movl gdt_addr, %ebx |
67 | movl %cr0,%eax |
62 | movl %ebx, 2(%eax) |
68 | orl $0x1,%eax |
- | 69 | movl %eax,%cr0 # switch to protected mode |
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63 | 70 | ||
64 | movl idt_addr, %ebx |
- | |
65 | leal idtr, %eax |
- | |
66 | movl %ebx, 2(%eax) |
71 | jmpl $40, $now_in_prot |
67 | 72 | ||
68 | # Load gdtr, idtr |
- | |
69 | lgdt gdtr |
- | |
70 | lidt idtr |
73 | no_long_mode: |
71 | 74 | 1: |
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72 | mov $1, %eax # Enable protected mode (CR0.PE = 1) |
- | |
73 | mov %eax, %cr0 |
75 | jmp 1b |
74 | 76 | ||
- | 77 | # Protected 16-bit. We want to reuse the code-seg descriptor, |
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- | 78 | # the Default operand size must not be 1 when entering long mode |
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75 | jmpl $8, $now_in_prot |
79 | now_in_prot: |
- | 80 | # Set up stack & data descriptors |
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- | 81 | movw $16, %ax |
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- | 82 | movw %ax, %ds |
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- | 83 | movw %ax, %fs |
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- | 84 | movw %ax, %gs |
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- | 85 | movw %ax, %ss |
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- | 86 | ||
- | 87 | # Enable 64-bit page transaltion entries - CR4.PAE = 1. |
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- | 88 | # Paging is not enabled until after long mode is enabled |
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- | 89 | movl %cr4, %eax |
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- | 90 | btsl $5, %eax |
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- | 91 | movl %eax, %cr4 |
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- | 92 | ||
- | 93 | # Set up paging tables |
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- | 94 | leal ptl_0, %eax |
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- | 95 | movl %eax, %cr3 |
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- | 96 | ||
- | 97 | # Enable long mode |
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- | 98 | movl $0xc0000080, %ecx # EFER MSR number |
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- | 99 | rdmsr # Read EFER |
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- | 100 | btsl $8, %eax # Set LME=1 |
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- | 101 | wrmsr # Write EFER |
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76 | 102 | ||
- | 103 | # Enable paging to activate long mode (set CR0.PG=1) |
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- | 104 | movl %cr0, %eax |
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- | 105 | btsl $31, %eax |
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77 | now_in_prot: |
106 | movl %eax, %cr0 |
78 | 107 | ||
- | 108 | # At this point we are in compatibility mode |
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- | 109 | jmpl $8, $start64 |
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79 | 110 | ||
80 | no_long_mode: |
111 | .code64 |
- | 112 | start64: |
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- | 113 | movq START_STACK_64, %rsp |
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- | 114 | ||
- | 115 | lidt idtr_inst |
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- | 116 | ||
- | 117 | call main_bsp # never returns |
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81 | 1: |
118 | 1: |
82 | jmp 1b |
119 | jmp 1b |
83 | 120 | ||
84 | 121 | ||
85 | .section K_DATA_START |
122 | .section K_DATA_START |
86 | .align 4096 |
123 | .align 4096 |
87 | page_directory: |
124 | .global ptl_2 |
- | 125 | ptl_2: |
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- | 126 | .quad 0x0 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE) |
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- | 127 | .quad 0x200000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE) |
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- | 128 | .quad 0x400000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE) |
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- | 129 | .quad 0x600000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE) |
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- | 130 | .quad 0x800000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE) |
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- | 131 | .quad 0xa00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE) |
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- | 132 | .quad 0xc00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE) |
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- | 133 | .quad 0xe00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE) |
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- | 134 | ||
- | 135 | .align 4096 |
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- | 136 | .global ptl_1 |
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- | 137 | ptl_1: |
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- | 138 | .quad ptl_2 + (PTL_WRITABLE | PTL_PRESENT) |
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88 | .space 4096, 0 |
139 | .fill 509,8,0 |
- | 140 | .quad ptl_2 + (PTL_WRITABLE | PTL_PRESENT) |
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- | 141 | .fill 2,8,0 |
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- | 142 | ||
- | 143 | .align 4096 |
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- | 144 | .global ptl_0 |
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- | 145 | ptl_0: |
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- | 146 | .quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT) |
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- | 147 | .fill 510,8,0 |
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- | 148 | .quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT) |
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89 | 149 | ||
- | 150 | .global gdtr_inst |
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90 | gdt_addr: |
151 | gdtr_inst: |
- | 152 | .word 7*8 # GDT_ITEMS * 8 |
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91 | .quad gdt + 0x80000000 |
153 | .long gdt + 0x80000000 |
- | 154 | ||
- | 155 | .global idtr_inst |
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92 | idt_addr: |
156 | idtr_inst: |
- | 157 | .word 0 |
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93 | .quad idt + 0x80000000 |
158 | .long idt + 0x80000000 |