Changeset e3fa1720 in mainline for kernel/arch/ia32/src/boot/multiboot2.S

Timestamp:

2018-11-13T20:14:30Z (6 years ago)

Author:

GitHub <noreply@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

2214382, 64f85f5

Parents:

6ae5e3f (diff), 9a791eb9 (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the (diff) links above to see all the changes relative to each parent.

git-author:

Jiří Zárevúcky <zarevucky.jiri@…> (2018-11-13 20:14:30)

git-committer:

GitHub <noreply@…> (2018-11-13 20:14:30)

Message:

Remove realmode VESA code (#59)

Enables framebuffer initialization via multiboot1(multiboot2 already did it), and removes the obsolete code. Then deduplicates code for the two multiboots.

File:

• kernel/arch/ia32/src/boot/multiboot2.S (modified) (3 diffs)

kernel/arch/ia32/src/boot/multiboot2.S

@@ -32 +32 @@
 #include <arch/cpuid.h>
 #include <genarch/multiboot/multiboot2.h>
-
-#define START_STACK  (BOOT_OFFSET - BOOT_STACK_SIZE)
 
 .section K_TEXT_START, "ax"
@@ -78 +76 @@
                 .word MULTIBOOT2_FLAGS_REQUIRED
                 .long tag_entry_address_end - tag_entry_address_start
-                .long multiboot2_image_start
+                .long multiboot_image_start
         tag_entry_address_end:
 
@@ -120 +118 @@
         tag_terminator_end:
 multiboot2_header_end:
-
-SYMBOL(multiboot2_image_start)
-        cli
-        cld
-
-        /* Initialize stack pointer */
-        movl $START_STACK, %esp
-
-        /*
-         * Initialize Global Descriptor Table and
-         * Interrupt Descriptor Table registers
-         */
-        lgdtl bootstrap_gdtr
-        lidtl bootstrap_idtr
-
-        /* Kernel data + stack */
-        movw $GDT_SELECTOR(KDATA_DES), %cx
-        movw %cx, %es
-        movw %cx, %fs
-        movw %cx, %gs
-        movw %cx, %ds
-        movw %cx, %ss
-
-        jmpl $GDT_SELECTOR(KTEXT_DES), $multiboot2_meeting_point
-        multiboot2_meeting_point:
-
-        /* Save multiboot arguments */
-        movl %eax, multiboot_eax
-        movl %ebx, multiboot_ebx
-
-#ifndef PROCESSOR_i486
-
-        movl $(INTEL_CPUID_LEVEL), %eax
-        cpuid
-        cmp $0x0, %eax  /* any function > 0? */
-        jbe pse_unsupported
-
-        movl $(INTEL_CPUID_STANDARD), %eax
-        cpuid
-        bt $(INTEL_PSE), %edx
-        jnc pse_unsupported
-
-                /* Map kernel and turn paging on */
-                call map_kernel_pse
-                jmp stack_init
-
-#endif /* PROCESSOR_i486 */
-
-        pse_unsupported:
-
-                /* Map kernel and turn paging on */
-                call map_kernel_non_pse
-
-        stack_init:
-
-        /* Create the first stack frame */
-        pushl $0
-        movl %esp, %ebp
-
-        /* Call ia32_pre_main(multiboot_eax, multiboot_ebx) */
-        pushl multiboot_ebx
-        pushl multiboot_eax
-        call ia32_pre_main
-
-        /* Call main_bsp() */
-        call main_bsp
-
-        /* Not reached */
-        cli
-        hlt0:
-                hlt
-                jmp hlt0