From d2ccde1c8e90d38cee87a1b0309ad2827f3fd30d Mon Sep 17 00:00:00 2001 From: hc <hc@nodka.com> Date: Mon, 11 Dec 2023 02:45:28 +0000 Subject: [PATCH] add boot partition size --- kernel/arch/x86/kernel/head_32.S | 110 +++++++++++++++++++++---------------------------------- 1 files changed, 42 insertions(+), 68 deletions(-) diff --git a/kernel/arch/x86/kernel/head_32.S b/kernel/arch/x86/kernel/head_32.S index 30f9cb2..3f1691b 100644 --- a/kernel/arch/x86/kernel/head_32.S +++ b/kernel/arch/x86/kernel/head_32.S @@ -23,6 +23,7 @@ #include <asm/cpufeatures.h> #include <asm/percpu.h> #include <asm/nops.h> +#include <asm/nospec-branch.h> #include <asm/bootparam.h> #include <asm/export.h> #include <asm/pgtable_32.h> @@ -64,14 +65,9 @@ * can. */ __HEAD -ENTRY(startup_32) +SYM_CODE_START(startup_32) movl pa(initial_stack),%ecx - /* test KEEP_SEGMENTS flag to see if the bootloader is asking - us to not reload segments */ - testb $KEEP_SEGMENTS, BP_loadflags(%esi) - jnz 2f - /* * Set segments to known values. */ @@ -82,7 +78,6 @@ movl %eax,%fs movl %eax,%gs movl %eax,%ss -2: leal -__PAGE_OFFSET(%ecx),%esp /* @@ -140,38 +135,8 @@ movl %eax,pa(initial_page_table+0xffc) #endif -#ifdef CONFIG_PARAVIRT - /* This is can only trip for a broken bootloader... */ - cmpw $0x207, pa(boot_params + BP_version) - jb .Ldefault_entry - - /* Paravirt-compatible boot parameters. Look to see what architecture - we're booting under. */ - movl pa(boot_params + BP_hardware_subarch), %eax - cmpl $num_subarch_entries, %eax - jae .Lbad_subarch - - movl pa(subarch_entries)(,%eax,4), %eax - subl $__PAGE_OFFSET, %eax - jmp *%eax - -.Lbad_subarch: -WEAK(xen_entry) - /* Unknown implementation; there's really - nothing we can do at this point. */ - ud2a - - __INITDATA - -subarch_entries: - .long .Ldefault_entry /* normal x86/PC */ - .long xen_entry /* Xen hypervisor */ - .long .Ldefault_entry /* Moorestown MID */ -num_subarch_entries = (. - subarch_entries) / 4 -.previous -#else jmp .Ldefault_entry -#endif /* CONFIG_PARAVIRT */ +SYM_CODE_END(startup_32) #ifdef CONFIG_HOTPLUG_CPU /* @@ -179,12 +144,12 @@ * up already except stack. We just set up stack here. Then call * start_secondary(). */ -ENTRY(start_cpu0) +SYM_FUNC_START(start_cpu0) movl initial_stack, %ecx movl %ecx, %esp call *(initial_code) 1: jmp 1b -ENDPROC(start_cpu0) +SYM_FUNC_END(start_cpu0) #endif /* @@ -195,7 +160,7 @@ * If cpu hotplug is not supported then this code can go in init section * which will be freed later */ -ENTRY(startup_32_smp) +SYM_FUNC_START(startup_32_smp) cld movl $(__BOOT_DS),%eax movl %eax,%ds @@ -362,7 +327,7 @@ call *(initial_code) 1: jmp 1b -ENDPROC(startup_32_smp) +SYM_FUNC_END(startup_32_smp) #include "verify_cpu.S" @@ -390,9 +355,9 @@ #endif andl $0,setup_once_ref /* Once is enough, thanks */ - ret + RET -ENTRY(early_idt_handler_array) +SYM_FUNC_START(early_idt_handler_array) # 36(%esp) %eflags # 32(%esp) %cs # 28(%esp) %eip @@ -407,9 +372,9 @@ i = i + 1 .fill early_idt_handler_array + i*EARLY_IDT_HANDLER_SIZE - ., 1, 0xcc .endr -ENDPROC(early_idt_handler_array) +SYM_FUNC_END(early_idt_handler_array) -early_idt_handler_common: +SYM_CODE_START_LOCAL(early_idt_handler_common) /* * The stack is the hardware frame, an error code or zero, and the * vector number. @@ -460,10 +425,10 @@ decl %ss:early_recursion_flag addl $4, %esp /* pop pt_regs->orig_ax */ iret -ENDPROC(early_idt_handler_common) +SYM_CODE_END(early_idt_handler_common) /* This is the default interrupt "handler" :-) */ -ENTRY(early_ignore_irq) +SYM_FUNC_START(early_ignore_irq) cld #ifdef CONFIG_PRINTK pushl %eax @@ -498,19 +463,16 @@ hlt_loop: hlt jmp hlt_loop -ENDPROC(early_ignore_irq) +SYM_FUNC_END(early_ignore_irq) __INITDATA .align 4 -GLOBAL(early_recursion_flag) - .long 0 +SYM_DATA(early_recursion_flag, .long 0) __REFDATA .align 4 -ENTRY(initial_code) - .long i386_start_kernel -ENTRY(setup_once_ref) - .long setup_once +SYM_DATA(initial_code, .long i386_start_kernel) +SYM_DATA(setup_once_ref, .long setup_once) #ifdef CONFIG_PAGE_TABLE_ISOLATION #define PGD_ALIGN (2 * PAGE_SIZE) @@ -553,7 +515,7 @@ __PAGE_ALIGNED_DATA /* Page-aligned for the benefit of paravirt? */ .align PGD_ALIGN -ENTRY(initial_page_table) +SYM_DATA_START(initial_page_table) .long pa(initial_pg_pmd+PGD_IDENT_ATTR),0 /* low identity map */ # if KPMDS == 3 .long pa(initial_pg_pmd+PGD_IDENT_ATTR),0 @@ -571,17 +533,28 @@ # error "Kernel PMDs should be 1, 2 or 3" # endif .align PAGE_SIZE /* needs to be page-sized too */ + +#ifdef CONFIG_PAGE_TABLE_ISOLATION + /* + * PTI needs another page so sync_initial_pagetable() works correctly + * and does not scribble over the data which is placed behind the + * actual initial_page_table. See clone_pgd_range(). + */ + .fill 1024, 4, 0 +#endif + +SYM_DATA_END(initial_page_table) #endif .data .balign 4 -ENTRY(initial_stack) - /* - * The SIZEOF_PTREGS gap is a convention which helps the in-kernel - * unwinder reliably detect the end of the stack. - */ - .long init_thread_union + THREAD_SIZE - SIZEOF_PTREGS - \ - TOP_OF_KERNEL_STACK_PADDING; +/* + * The SIZEOF_PTREGS gap is a convention which helps the in-kernel unwinder + * reliably detect the end of the stack. + */ +SYM_DATA(initial_stack, + .long init_thread_union + THREAD_SIZE - + SIZEOF_PTREGS - TOP_OF_KERNEL_STACK_PADDING) __INITRODATA int_msg: @@ -597,27 +570,28 @@ */ .data -.globl boot_gdt_descr - ALIGN # early boot GDT descriptor (must use 1:1 address mapping) .word 0 # 32 bit align gdt_desc.address -boot_gdt_descr: +SYM_DATA_START_LOCAL(boot_gdt_descr) .word __BOOT_DS+7 .long boot_gdt - __PAGE_OFFSET +SYM_DATA_END(boot_gdt_descr) # boot GDT descriptor (later on used by CPU#0): .word 0 # 32 bit align gdt_desc.address -ENTRY(early_gdt_descr) +SYM_DATA_START(early_gdt_descr) .word GDT_ENTRIES*8-1 .long gdt_page /* Overwritten for secondary CPUs */ +SYM_DATA_END(early_gdt_descr) /* * The boot_gdt must mirror the equivalent in setup.S and is * used only for booting. */ .align L1_CACHE_BYTES -ENTRY(boot_gdt) +SYM_DATA_START(boot_gdt) .fill GDT_ENTRY_BOOT_CS,8,0 .quad 0x00cf9a000000ffff /* kernel 4GB code at 0x00000000 */ .quad 0x00cf92000000ffff /* kernel 4GB data at 0x00000000 */ +SYM_DATA_END(boot_gdt) -- Gitblit v1.6.2