add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/x86/kernel/process_32.c
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@@ -39,53 +39,43 @@
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 #include <linux/kdebug.h>
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 #include <linux/syscalls.h>
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-#include <asm/pgtable.h>
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 #include <asm/ldt.h>
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 #include <asm/processor.h>
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 #include <asm/fpu/internal.h>
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 #include <asm/desc.h>
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-#ifdef CONFIG_MATH_EMULATION
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-#include <asm/math_emu.h>
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-#endif
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 #include <linux/err.h>
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 #include <asm/tlbflush.h>
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 #include <asm/cpu.h>
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-#include <asm/syscalls.h>
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 #include <asm/debugreg.h>
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 #include <asm/switch_to.h>
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 #include <asm/vm86.h>
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-#include <asm/intel_rdt_sched.h>
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+#include <asm/resctrl.h>
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 #include <asm/proto.h>
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 #include "process.h"
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58
 
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-void __show_regs(struct pt_regs *regs, enum show_regs_mode mode)
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+void __show_regs(struct pt_regs *regs, enum show_regs_mode mode,
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+		 const char *log_lvl)
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 {
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 	unsigned long cr0 = 0L, cr2 = 0L, cr3 = 0L, cr4 = 0L;
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 	unsigned long d0, d1, d2, d3, d6, d7;
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-	unsigned long sp;
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-	unsigned short ss, gs;
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+	unsigned short gs;
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-	if (user_mode(regs)) {
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-		sp = regs->sp;
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-		ss = regs->ss;
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+	if (user_mode(regs))
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 		gs = get_user_gs(regs);
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-	} else {
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-		sp = kernel_stack_pointer(regs);
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-		savesegment(ss, ss);
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+	else
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 		savesegment(gs, gs);
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-	}
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-	show_ip(regs, KERN_DEFAULT);
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+	show_ip(regs, log_lvl);
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-	printk(KERN_DEFAULT "EAX: %08lx EBX: %08lx ECX: %08lx EDX: %08lx\n",
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-		regs->ax, regs->bx, regs->cx, regs->dx);
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-	printk(KERN_DEFAULT "ESI: %08lx EDI: %08lx EBP: %08lx ESP: %08lx\n",
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-		regs->si, regs->di, regs->bp, sp);
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-	printk(KERN_DEFAULT "DS: %04x ES: %04x FS: %04x GS: %04x SS: %04x EFLAGS: %08lx\n",
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-	       (u16)regs->ds, (u16)regs->es, (u16)regs->fs, gs, ss, regs->flags);
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+	printk("%sEAX: %08lx EBX: %08lx ECX: %08lx EDX: %08lx\n",
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+		log_lvl, regs->ax, regs->bx, regs->cx, regs->dx);
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+	printk("%sESI: %08lx EDI: %08lx EBP: %08lx ESP: %08lx\n",
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+		log_lvl, regs->si, regs->di, regs->bp, regs->sp);
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+	printk("%sDS: %04x ES: %04x FS: %04x GS: %04x SS: %04x EFLAGS: %08lx\n",
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+	       log_lvl, (u16)regs->ds, (u16)regs->es, (u16)regs->fs, gs, regs->ss, regs->flags);
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 	if (mode != SHOW_REGS_ALL)
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 		return;
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@@ -94,8 +84,8 @@
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 	cr2 = read_cr2();
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 	cr3 = __read_cr3();
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 	cr4 = __read_cr4();
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-	printk(KERN_DEFAULT "CR0: %08lx CR2: %08lx CR3: %08lx CR4: %08lx\n",
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-			cr0, cr2, cr3, cr4);
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+	printk("%sCR0: %08lx CR2: %08lx CR3: %08lx CR4: %08lx\n",
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+		log_lvl, cr0, cr2, cr3, cr4);
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 	get_debugreg(d0, 0);
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 	get_debugreg(d1, 1);
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@@ -109,84 +99,16 @@
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 	    (d6 == DR6_RESERVED) && (d7 == 0x400))
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 		return;
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-	printk(KERN_DEFAULT "DR0: %08lx DR1: %08lx DR2: %08lx DR3: %08lx\n",
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-			d0, d1, d2, d3);
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-	printk(KERN_DEFAULT "DR6: %08lx DR7: %08lx\n",
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-			d6, d7);
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+	printk("%sDR0: %08lx DR1: %08lx DR2: %08lx DR3: %08lx\n",
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+		log_lvl, d0, d1, d2, d3);
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+	printk("%sDR6: %08lx DR7: %08lx\n",
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+		log_lvl, d6, d7);
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 }
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 void release_thread(struct task_struct *dead_task)
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 {
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 	BUG_ON(dead_task->mm);
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 	release_vm86_irqs(dead_task);
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-}
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-
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-int copy_thread_tls(unsigned long clone_flags, unsigned long sp,
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-	unsigned long arg, struct task_struct *p, unsigned long tls)
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-{
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-	struct pt_regs *childregs = task_pt_regs(p);
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-	struct fork_frame *fork_frame = container_of(childregs, struct fork_frame, regs);
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-	struct inactive_task_frame *frame = &fork_frame->frame;
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-	struct task_struct *tsk;
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-	int err;
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-
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-	/*
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-	 * For a new task use the RESET flags value since there is no before.
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-	 * All the status flags are zero; DF and all the system flags must also
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-	 * be 0, specifically IF must be 0 because we context switch to the new
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-	 * task with interrupts disabled.
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-	 */
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-	frame->flags = X86_EFLAGS_FIXED;
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-	frame->bp = 0;
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-	frame->ret_addr = (unsigned long) ret_from_fork;
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-	p->thread.sp = (unsigned long) fork_frame;
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-	p->thread.sp0 = (unsigned long) (childregs+1);
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-	memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps));
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-
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-	if (unlikely(p->flags & PF_KTHREAD)) {
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-		/* kernel thread */
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-		memset(childregs, 0, sizeof(struct pt_regs));
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-		frame->bx = sp;		/* function */
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-		frame->di = arg;
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-		p->thread.io_bitmap_ptr = NULL;
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-		return 0;
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-	}
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-	frame->bx = 0;
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-	*childregs = *current_pt_regs();
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-	childregs->ax = 0;
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-	if (sp)
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-		childregs->sp = sp;
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-
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-	task_user_gs(p) = get_user_gs(current_pt_regs());
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-
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-	p->thread.io_bitmap_ptr = NULL;
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-	tsk = current;
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-	err = -ENOMEM;
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-
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-	if (unlikely(test_tsk_thread_flag(tsk, TIF_IO_BITMAP))) {
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-		p->thread.io_bitmap_ptr = kmemdup(tsk->thread.io_bitmap_ptr,
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-						IO_BITMAP_BYTES, GFP_KERNEL);
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-		if (!p->thread.io_bitmap_ptr) {
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-			p->thread.io_bitmap_max = 0;
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-			return -ENOMEM;
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-		}
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-		set_tsk_thread_flag(p, TIF_IO_BITMAP);
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-	}
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-
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-	err = 0;
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-
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-	/*
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-	 * Set a new TLS for the child thread?
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-	 */
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-	if (clone_flags & CLONE_SETTLS)
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-		err = do_set_thread_area(p, -1,
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-			(struct user_desc __user *)tls, 0);
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-
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-	if (err && p->thread.io_bitmap_ptr) {
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-		kfree(p->thread.io_bitmap_ptr);
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-		p->thread.io_bitmap_max = 0;
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-	}
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-	return err;
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 }
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 void
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@@ -201,7 +123,6 @@
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 	regs->ip		= new_ip;
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 	regs->sp		= new_sp;
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 	regs->flags		= X86_EFLAGS_IF;
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-	force_iret();
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 }
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 EXPORT_SYMBOL_GPL(start_thread);
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@@ -238,13 +159,12 @@
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 {
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 	struct thread_struct *prev = &prev_p->thread,
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 			     *next = &next_p->thread;
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-	struct fpu *prev_fpu = &prev->fpu;
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-	struct fpu *next_fpu = &next->fpu;
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 	int cpu = smp_processor_id();
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 	/* never put a printk in __switch_to... printk() calls wake_up*() indirectly */
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-	switch_fpu_prepare(prev_fpu, cpu);
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+	if (!test_thread_flag(TIF_NEED_FPU_LOAD))
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+		switch_fpu_prepare(prev_p, cpu);
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 	/*
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 	 * Save away %gs. No need to save %fs, as it was saved on the
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@@ -263,23 +183,12 @@
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 	 */
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 	load_TLS(next, cpu);
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-	/*
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-	 * Restore IOPL if needed.  In normal use, the flags restore
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-	 * in the switch assembly will handle this.  But if the kernel
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-	 * is running virtualized at a non-zero CPL, the popf will
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-	 * not restore flags, so it must be done in a separate step.
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-	 */
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-	if (get_kernel_rpl() && unlikely(prev->iopl != next->iopl))
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-		set_iopl_mask(next->iopl);
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-
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 	switch_to_extra(prev_p, next_p);
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 	/*
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 	 * Leave lazy mode, flushing any hypercalls made here.
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 	 * This must be done before restoring TLS segments so
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-	 * the GDT and LDT are properly updated, and must be
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-	 * done before fpu__restore(), so the TS bit is up
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-	 * to date.
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+	 * the GDT and LDT are properly updated.
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 	 */
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 	arch_end_context_switch(next_p);
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..
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@@ -300,12 +209,12 @@
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 	if (prev->gs | next->gs)
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 		lazy_load_gs(next->gs);
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-	switch_fpu_finish(next_fpu, cpu);
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-
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 	this_cpu_write(current_task, next_p);
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+	switch_fpu_finish(next_p);
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+
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 	/* Load the Intel cache allocation PQR MSR. */
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-	intel_rdt_sched_in();
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+	resctrl_sched_in(next_p);
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 	return prev_p;
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 }