Changes in kernel/arch/ia32/src/boot/boot.S [e3e4a2c:f4fa6d9] in mainline
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kernel/arch/ia32/src/boot/boot.S (modified) (7 diffs)
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kernel/arch/ia32/src/boot/boot.S
re3e4a2c rf4fa6d9 99 99 #include "vesa_prot.inc" 100 100 101 #ifndef PROCESSOR_i486 102 103 pm_status $status_prot2 104 105 movl $(INTEL_CPUID_LEVEL), %eax 106 cpuid 107 cmp $0x0, %eax /* any function > 0? */ 108 jbe pse_unsupported 109 110 movl $(INTEL_CPUID_STANDARD), %eax 111 cpuid 112 bt $(INTEL_PSE), %edx 113 jnc pse_unsupported 114 115 /* Map kernel and turn paging on */ 116 pm_status $status_pse 117 call map_kernel_pse 118 jmp stack_init 119 120 #endif /* PROCESSOR_i486 */ 121 122 pse_unsupported: 123 124 /* Map kernel and turn paging on */ 125 pm_status $status_non_pse 126 call map_kernel 127 128 stack_init: 101 /* Map kernel and turn paging on */ 102 call map_kernel 129 103 130 104 /* Create the first stack frame */ … … 132 106 movl %esp, %ebp 133 107 134 pm2_status $status_prot 3108 pm2_status $status_prot2 135 109 136 110 /* Call arch_pre_main(grub_eax, grub_ebx) */ … … 150 124 jmp hlt0 151 125 152 /** Setup mapping for the kernel (PSE variant) 153 * 154 * Setup mapping for both the unmapped and mapped sections 155 * of the kernel. For simplicity, we map the entire 4G space. 156 * 157 */ 158 .global map_kernel_pse 159 map_kernel_pse: 160 /* Paging features */ 161 movl %cr4, %ecx 162 orl $(1 << 4), %ecx /* PSE on */ 163 andl $(~(1 << 5)), %ecx /* PAE off */ 164 movl %ecx, %cr4 165 166 movl $(page_directory + 0), %esi 167 movl $(page_directory + 2048), %edi 168 xorl %ecx, %ecx 169 xorl %ebx, %ebx 170 171 floop_pse: 172 movl $((1 << 7) | (1 << 1) | (1 << 0)), %eax 173 orl %ebx, %eax 174 /* Mapping 0x00000000 + %ecx * 4M => 0x00000000 + %ecx * 4M */ 175 movl %eax, (%esi, %ecx, 4) 176 /* Mapping 0x80000000 + %ecx * 4M => 0x00000000 + %ecx * 4M */ 177 movl %eax, (%edi, %ecx, 4) 178 addl $(4 * 1024 * 1024), %ebx 179 180 incl %ecx 181 cmpl $512, %ecx 182 jl floop_pse 183 184 movl %esi, %cr3 185 186 movl %cr0, %ebx 187 orl $(1 << 31), %ebx /* paging on */ 188 movl %ebx, %cr0 126 /** Calculate unmapped address of the end of the kernel. */ 127 calc_end_of_kernel: 128 movl $hardcoded_load_address, %edi 129 andl $0x7fffffff, %edi 130 movl (%edi), %esi 131 andl $0x7fffffff, %esi 132 133 movl $hardcoded_ktext_size, %edi 134 andl $0x7fffffff, %edi 135 addl (%edi), %esi 136 andl $0x7fffffff, %esi 137 138 movl $hardcoded_kdata_size, %edi 139 andl $0x7fffffff, %edi 140 addl (%edi), %esi 141 andl $0x7fffffff, %esi 142 movl %esi, end_of_kernel 189 143 ret 190 144 191 /** Setup mapping for the kernel (non-PSE variant). 145 /** Find free 2M (+4k for alignment) region where to store page tables */ 146 find_mem_for_pt: 147 /* Check if multiboot info is present */ 148 cmpl $0x2BADB002, grub_eax 149 je check_multiboot_map 150 ret 151 check_multiboot_map: 152 /* Copy address of the multiboot info to ebx */ 153 movl grub_ebx, %ebx 154 /* Check if memory map flag is present */ 155 movl (%ebx), %edx 156 andl $(1 << 6), %edx 157 jnz use_multiboot_map 158 ret 159 use_multiboot_map: 160 /* Copy address of the memory map to edx */ 161 movl 48(%ebx), %edx 162 movl %edx, %ecx 163 addl 44(%ebx), %ecx 164 /* Find a free region at least 2M in size */ 165 check_memmap_loop: 166 /* Is this a free region? */ 167 cmp $1, 20(%edx) 168 jnz next_region 169 /* Check size */ 170 cmp $0, 16(%edx) 171 jnz next_region 172 cmpl $(2 * 1024 * 1024 + 4 * 1024), 12(%edx) 173 jbe next_region 174 cmp $0, 8(%edx) 175 jz found_region 176 next_region: 177 cmp %ecx, %edx 178 jbe next_region_do 179 ret 180 next_region_do: 181 addl (%edx), %edx 182 addl $4, %edx 183 jmp check_memmap_loop 184 found_region: 185 /* Use end of the found region */ 186 mov 4(%edx), %ecx 187 add 12(%edx), %ecx 188 sub $(2 * 1024 * 1024), %ecx 189 mov %ecx, free_area 190 ret 191 192 193 /** Setup mapping for the kernel. 192 194 * 193 195 * Setup mapping for both the unmapped and mapped sections … … 202 204 movl %ecx, %cr4 203 205 204 call calc_ kernel_end206 call calc_end_of_kernel 205 207 call find_mem_for_pt 206 207 mov kernel_end, %esi 208 mov end_of_kernel, %esi 208 209 mov free_area, %ecx 209 210 210 cmpl %esi, %ecx 211 jbe use_kernel_end 212 213 mov %ecx, %esi 214 215 /* Align address down to 4k */ 216 andl $(~4095), %esi 217 218 use_kernel_end: 219 220 /* Align address to 4k */ 221 addl $4095, %esi 222 andl $(~4095), %esi 223 224 /* Allocate space for page tables */ 225 movl %esi, pt_loc 226 movl $ballocs, %edi 227 andl $0x7fffffff, %edi 228 229 movl %esi, (%edi) 230 addl $4, %edi 231 movl $(2 * 1024 * 1024), (%edi) 232 233 /* Fill page tables */ 234 xorl %ecx, %ecx 235 xorl %ebx, %ebx 236 237 floop_pt: 238 movl $((1 << 1) | (1 << 0)), %eax 239 orl %ebx, %eax 240 movl %eax, (%esi, %ecx, 4) 241 addl $(4 * 1024), %ebx 242 243 incl %ecx 244 cmpl $(512 * 1024), %ecx 245 246 jl floop_pt 247 248 /* Fill page directory */ 249 movl $(page_directory + 0), %esi 250 movl $(page_directory + 2048), %edi 251 xorl %ecx, %ecx 252 movl pt_loc, %ebx 253 254 floop: 255 movl $((1 << 1) | (1 << 0)), %eax 256 orl %ebx, %eax 257 258 /* Mapping 0x00000000 + %ecx * 4M => 0x00000000 + %ecx * 4M */ 259 movl %eax, (%esi, %ecx, 4) 260 261 /* Mapping 0x80000000 + %ecx * 4M => 0x00000000 + %ecx * 4M */ 262 movl %eax, (%edi, %ecx, 4) 263 addl $(4 * 1024), %ebx 264 265 incl %ecx 266 cmpl $512, %ecx 267 268 jl floop 269 270 movl %esi, %cr3 271 272 movl %cr0, %ebx 273 orl $(1 << 31), %ebx /* paging on */ 274 movl %ebx, %cr0 275 276 ret 277 278 /** Calculate unmapped address of the end of the kernel. */ 279 calc_kernel_end: 280 movl $hardcoded_load_address, %edi 211 jbe use_end_of_kernel 212 mov %ecx, %esi 213 /* Align address down to 4k */ 214 andl $(~4095), %esi 215 use_end_of_kernel: 216 217 /* Align address to 4k */ 218 addl $4095, %esi 219 andl $(~4095), %esi 220 221 /* Allocate space for page tables*/ 222 movl %esi, pt_loc 223 movl $ballocs, %edi 281 224 andl $0x7fffffff, %edi 282 movl (%edi), %esi 283 andl $0x7fffffff, %esi 284 285 movl $hardcoded_ktext_size, %edi 286 andl $0x7fffffff, %edi 287 addl (%edi), %esi 288 andl $0x7fffffff, %esi 289 290 movl $hardcoded_kdata_size, %edi 291 andl $0x7fffffff, %edi 292 addl (%edi), %esi 293 andl $0x7fffffff, %esi 294 movl %esi, kernel_end 295 225 movl %esi, (%edi) 226 addl $4, %edi 227 movl $(2*1024*1024), (%edi) 228 229 /* Fill page tables */ 230 xorl %ecx, %ecx 231 xorl %ebx, %ebx 232 233 floop_pt: 234 movl $((1 << 1) | (1 << 0)), %eax 235 orl %ebx, %eax 236 movl %eax, (%esi, %ecx, 4) 237 addl $(4 * 1024), %ebx 238 239 incl %ecx 240 cmpl $(512 * 1024), %ecx 241 jl floop_pt 242 243 /* Fill page directory */ 244 movl $(page_directory + 0), %esi 245 movl $(page_directory + 2048), %edi 246 xorl %ecx, %ecx 247 movl pt_loc, %ebx 248 249 floop: 250 movl $((1 << 1) | (1 << 0)), %eax 251 orl %ebx, %eax 252 /* Mapping 0x00000000 + %ecx * 4M => 0x00000000 + %ecx * 4M */ 253 movl %eax, (%esi, %ecx, 4) 254 /* Mapping 0x80000000 + %ecx * 4M => 0x00000000 + %ecx * 4M */ 255 movl %eax, (%edi, %ecx, 4) 256 addl $(4 * 1024), %ebx 257 258 incl %ecx 259 cmpl $512, %ecx 260 jl floop 261 262 movl %esi, %cr3 263 264 movl %cr0, %ebx 265 orl $(1 << 31), %ebx /* paging on */ 266 movl %ebx, %cr0 296 267 ret 297 298 /** Find free 2M (+4k for alignment) region where to store page tables */299 find_mem_for_pt:300 /* Check if multiboot info is present */301 cmpl $MULTIBOOT_LOADER_MAGIC, grub_eax302 je check_multiboot_map303 304 ret305 306 check_multiboot_map:307 308 /* Copy address of the multiboot info to ebx */309 movl grub_ebx, %ebx310 311 /* Check if memory map flag is present */312 movl (%ebx), %edx313 andl $(1 << 6), %edx314 jnz use_multiboot_map315 316 ret317 318 use_multiboot_map:319 320 /* Copy address of the memory map to edx */321 movl 48(%ebx), %edx322 movl %edx, %ecx323 324 addl 44(%ebx), %ecx325 326 /* Find a free region at least 2M in size */327 check_memmap_loop:328 329 /* Is this a free region? */330 cmp $1, 20(%edx)331 jnz next_region332 333 /* Check size */334 cmp $0, 16(%edx)335 jnz next_region336 337 cmpl $(2 * 1024 * 1024 + 4 * 1024), 12(%edx)338 jbe next_region339 340 cmp $0, 8(%edx)341 jz found_region342 343 next_region:344 345 cmp %ecx, %edx346 jbe next_region_do347 348 ret349 350 next_region_do:351 352 addl (%edx), %edx353 addl $4, %edx354 jmp check_memmap_loop355 356 found_region:357 358 /* Use end of the found region */359 mov 4(%edx), %ecx360 add 12(%edx), %ecx361 sub $(2 * 1024 * 1024), %ecx362 mov %ecx, free_area363 364 ret365 268 366 269 /** Print string to EGA display (in light red) and halt. … … 707 610 grub_eax: 708 611 .long 0 612 709 613 grub_ebx: 710 614 .long 0 … … 712 616 pt_loc: 713 617 .long 0 714 kernel_end:618 end_of_kernel: 715 619 .long 0 716 620 free_area: 717 621 .long 0 718 622 623 err_pse: 624 .asciz "Page Size Extension not supported. System halted." 625 719 626 status_prot: 720 627 .asciz "[prot] " 721 status_pse:722 .asciz "[pse] "723 status_non_pse:724 .asciz "[non_pse] "725 628 status_vesa_copy: 726 629 .asciz "[vesa_copy] " … … 731 634 status_prot2: 732 635 .asciz "[prot2] " 733 status_prot3:734 .asciz "[prot3] "735 636 status_main: 736 637 .asciz "[main] "
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