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author | Simon Rettberg | 2024-04-12 14:52:06 +0200 |
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committer | Simon Rettberg | 2024-04-12 14:52:06 +0200 |
commit | 2ae76865d3d109712f9ee488cbc19bd107bbc9ab (patch) | |
tree | 36e7310eb089cf7fd3496e5c32c70981e447f235 /src/arch/x86/transitions | |
parent | Merge branch 'aqc1xx' into openslx (diff) | |
parent | [netdevice] Add "linktype" setting (diff) | |
download | ipxe-2ae76865d3d109712f9ee488cbc19bd107bbc9ab.tar.gz ipxe-2ae76865d3d109712f9ee488cbc19bd107bbc9ab.tar.xz ipxe-2ae76865d3d109712f9ee488cbc19bd107bbc9ab.zip |
Merge branch 'master' into openslxopenslx
Diffstat (limited to 'src/arch/x86/transitions')
-rw-r--r-- | src/arch/x86/transitions/librm.S | 67 | ||||
-rw-r--r-- | src/arch/x86/transitions/librm_mgmt.c | 26 |
2 files changed, 93 insertions, 0 deletions
diff --git a/src/arch/x86/transitions/librm.S b/src/arch/x86/transitions/librm.S index 39431324..a93b0251 100644 --- a/src/arch/x86/transitions/librm.S +++ b/src/arch/x86/transitions/librm.S @@ -1632,3 +1632,70 @@ init_pages: /* Return */ ret + +/**************************************************************************** + * sipi (real-mode jump) + * + * Handle Startup IPI + * + * This code must be copied to a page-aligned boundary in base memory. + * It will be entered with %cs:0000 pointing to the start of the code. + * The stack pointer is undefined and so no stack space can be used. + * + **************************************************************************** + */ + .section ".text16.sipi", "ax", @progbits + .code16 + .globl sipi +sipi: + /* Retrieve rm_ds from copy */ + movw %cs:( sipi_ds - sipi ), %ax + movw %ax, %ds + + /* Load GDT and switch to protected mode */ + data32 lgdt gdtr + movl %cr0, %eax + orb $CR0_PE, %al + movl %eax, %cr0 + data32 ljmp $VIRTUAL_CS, $VIRTUAL(1f) + + /* Copy of rm_ds required to access GDT */ + .globl sipi_ds +sipi_ds: + .word 0 + + /* Length of real-mode SIPI handler to be copied */ + .globl sipi_len + .equ sipi_len, . - sipi + + .section ".text.sipi", "ax", @progbits + .code32 +1: /* Set up protected-mode segment registers (with no stack) */ + movw $VIRTUAL_DS, %ax + movw %ax, %ds + movw %ax, %ss + movw $PHYSICAL_DS, %ax + movw %ax, %es + movw %ax, %fs + movw %ax, %gs + + /* Load register state and clear stack pointer */ + movl $VIRTUAL(sipi_regs), %esp + popal + + /* Switch to flat physical addressing */ + movw $PHYSICAL_DS, %sp + movw %sp, %ds + movw %sp, %ss + + /* Clear stack pointer */ + xorl %esp, %esp + + /* Jump to protected-mode SIPI handler */ + ljmp %cs:*VIRTUAL(sipi_handler) + + /* Protected-mode SIPI handler vector */ + .section ".data.sipi_handler", "aw", @progbits + .globl sipi_handler +sipi_handler: + .long 0, PHYSICAL_CS diff --git a/src/arch/x86/transitions/librm_mgmt.c b/src/arch/x86/transitions/librm_mgmt.c index da221e8b..b3820589 100644 --- a/src/arch/x86/transitions/librm_mgmt.c +++ b/src/arch/x86/transitions/librm_mgmt.c @@ -45,6 +45,9 @@ struct idtr64 idtr64 = { .limit = ( sizeof ( idt64 ) - 1 ), }; +/** Startup IPI register state */ +struct i386_regs sipi_regs; + /** Length of stack dump */ #define STACK_DUMP_LEN 128 @@ -402,6 +405,29 @@ __asmcall void check_fxsr ( struct i386_all_regs *regs ) { ( ( regs->flags & CF ) ? " not" : "" ) ); } +/** + * Set up startup IPI handler + * + * @v vector Startup IPI vector + * @v handler Protected-mode startup IPI handler physical address + * @v regs Initial register state + */ +void setup_sipi ( unsigned int vector, uint32_t handler, + struct i386_regs *regs ) { + + /* Record protected-mode handler */ + sipi_handler = handler; + + /* Update copy of rm_ds */ + sipi_ds = rm_ds; + + /* Save register state */ + memcpy ( &sipi_regs, regs, sizeof ( sipi_regs ) ); + + /* Copy real-mode handler */ + copy_to_real ( ( vector << 8 ), 0, sipi, ( ( size_t ) sipi_len ) ); +} + PROVIDE_UACCESS_INLINE ( librm, phys_to_user ); PROVIDE_UACCESS_INLINE ( librm, user_to_phys ); PROVIDE_UACCESS_INLINE ( librm, virt_to_user ); |