From 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 10 May 2024 07:44:59 +0000
Subject: [PATCH] gmac get mac form eeprom
---
kernel/arch/x86/kernel/process.c | 301 +++++++++++++++++++++++++++++++++++++------------
1 files changed, 226 insertions(+), 75 deletions(-)
diff --git a/kernel/arch/x86/kernel/process.c b/kernel/arch/x86/kernel/process.c
index cd138bf..1cba09a 100644
--- a/kernel/arch/x86/kernel/process.c
+++ b/kernel/arch/x86/kernel/process.c
@@ -22,11 +22,12 @@
#include <linux/utsname.h>
#include <linux/stackprotector.h>
#include <linux/cpuidle.h>
+#include <linux/acpi.h>
+#include <linux/elf-randomize.h>
#include <trace/events/power.h>
#include <linux/hw_breakpoint.h>
#include <asm/cpu.h>
#include <asm/apic.h>
-#include <asm/syscalls.h>
#include <linux/uaccess.h>
#include <asm/mwait.h>
#include <asm/fpu/internal.h>
@@ -39,6 +40,9 @@
#include <asm/desc.h>
#include <asm/prctl.h>
#include <asm/spec-ctrl.h>
+#include <asm/io_bitmap.h>
+#include <asm/proto.h>
+#include <asm/frame.h>
#include "process.h"
@@ -69,18 +73,9 @@
#ifdef CONFIG_X86_32
.ss0 = __KERNEL_DS,
.ss1 = __KERNEL_CS,
- .io_bitmap_base = INVALID_IO_BITMAP_OFFSET,
#endif
+ .io_bitmap_base = IO_BITMAP_OFFSET_INVALID,
},
-#ifdef CONFIG_X86_32
- /*
- * Note that the .io_bitmap member must be extra-big. This is because
- * the CPU will access an additional byte beyond the end of the IO
- * permission bitmap. The extra byte must be all 1 bits, and must
- * be within the limit.
- */
- .io_bitmap = { [0 ... IO_BITMAP_LONGS] = ~0 },
-#endif
};
EXPORT_PER_CPU_SYMBOL(cpu_tss_rw);
@@ -98,35 +93,116 @@
dst->thread.vm86 = NULL;
#endif
- return fpu__copy(&dst->thread.fpu, &src->thread.fpu);
+ return fpu__copy(dst, src);
}
/*
- * Free current thread data structures etc..
+ * Free thread data structures etc..
*/
void exit_thread(struct task_struct *tsk)
{
struct thread_struct *t = &tsk->thread;
- unsigned long *bp = t->io_bitmap_ptr;
struct fpu *fpu = &t->fpu;
- if (bp) {
- struct tss_struct *tss = &per_cpu(cpu_tss_rw, get_cpu());
-
- t->io_bitmap_ptr = NULL;
- clear_thread_flag(TIF_IO_BITMAP);
- /*
- * Careful, clear this in the TSS too:
- */
- memset(tss->io_bitmap, 0xff, t->io_bitmap_max);
- t->io_bitmap_max = 0;
- put_cpu();
- kfree(bp);
- }
+ if (test_thread_flag(TIF_IO_BITMAP))
+ io_bitmap_exit(tsk);
free_vm86(t);
fpu__drop(fpu);
+}
+
+static int set_new_tls(struct task_struct *p, unsigned long tls)
+{
+ struct user_desc __user *utls = (struct user_desc __user *)tls;
+
+ if (in_ia32_syscall())
+ return do_set_thread_area(p, -1, utls, 0);
+ else
+ return do_set_thread_area_64(p, ARCH_SET_FS, tls);
+}
+
+int copy_thread(unsigned long clone_flags, unsigned long sp, unsigned long arg,
+ struct task_struct *p, unsigned long tls)
+{
+ struct inactive_task_frame *frame;
+ struct fork_frame *fork_frame;
+ struct pt_regs *childregs;
+ int ret = 0;
+
+ childregs = task_pt_regs(p);
+ fork_frame = container_of(childregs, struct fork_frame, regs);
+ frame = &fork_frame->frame;
+
+ frame->bp = encode_frame_pointer(childregs);
+ frame->ret_addr = (unsigned long) ret_from_fork;
+ p->thread.sp = (unsigned long) fork_frame;
+ p->thread.io_bitmap = NULL;
+ p->thread.iopl_warn = 0;
+ memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps));
+
+#ifdef CONFIG_X86_64
+ current_save_fsgs();
+ p->thread.fsindex = current->thread.fsindex;
+ p->thread.fsbase = current->thread.fsbase;
+ p->thread.gsindex = current->thread.gsindex;
+ p->thread.gsbase = current->thread.gsbase;
+
+ savesegment(es, p->thread.es);
+ savesegment(ds, p->thread.ds);
+#else
+ p->thread.sp0 = (unsigned long) (childregs + 1);
+ /*
+ * Clear all status flags including IF and set fixed bit. 64bit
+ * does not have this initialization as the frame does not contain
+ * flags. The flags consistency (especially vs. AC) is there
+ * ensured via objtool, which lacks 32bit support.
+ */
+ frame->flags = X86_EFLAGS_FIXED;
+#endif
+
+ /* Kernel thread ? */
+ if (unlikely(p->flags & PF_KTHREAD)) {
+ memset(childregs, 0, sizeof(struct pt_regs));
+ kthread_frame_init(frame, sp, arg);
+ return 0;
+ }
+
+ frame->bx = 0;
+ *childregs = *current_pt_regs();
+ childregs->ax = 0;
+ if (sp)
+ childregs->sp = sp;
+
+#ifdef CONFIG_X86_32
+ task_user_gs(p) = get_user_gs(current_pt_regs());
+#endif
+
+ if (unlikely(p->flags & PF_IO_WORKER)) {
+ /*
+ * An IO thread is a user space thread, but it doesn't
+ * return to ret_after_fork().
+ *
+ * In order to indicate that to tools like gdb,
+ * we reset the stack and instruction pointers.
+ *
+ * It does the same kernel frame setup to return to a kernel
+ * function that a kernel thread does.
+ */
+ childregs->sp = 0;
+ childregs->ip = 0;
+ kthread_frame_init(frame, sp, arg);
+ return 0;
+ }
+
+ /* Set a new TLS for the child thread? */
+ if (clone_flags & CLONE_SETTLS)
+ ret = set_new_tls(p, tls);
+
+ if (!ret && unlikely(test_tsk_thread_flag(current, TIF_IO_BITMAP)))
+ io_bitmap_share(p);
+
+ return ret;
}
void flush_thread(void)
@@ -136,7 +212,7 @@
flush_ptrace_hw_breakpoint(tsk);
memset(tsk->thread.tls_array, 0, sizeof(tsk->thread.tls_array));
- fpu__clear(&tsk->thread.fpu);
+ fpu__clear_all(&tsk->thread.fpu);
}
void disable_TSC(void)
@@ -233,7 +309,7 @@
static int set_cpuid_mode(struct task_struct *task, unsigned long cpuid_enabled)
{
- if (!static_cpu_has(X86_FEATURE_CPUID_FAULT))
+ if (!boot_cpu_has(X86_FEATURE_CPUID_FAULT))
return -ENODEV;
if (cpuid_enabled)
@@ -252,33 +328,96 @@
/* If cpuid was previously disabled for this task, re-enable it. */
if (test_thread_flag(TIF_NOCPUID))
enable_cpuid();
-}
-static inline void switch_to_bitmap(struct thread_struct *prev,
- struct thread_struct *next,
- unsigned long tifp, unsigned long tifn)
-{
- struct tss_struct *tss = this_cpu_ptr(&cpu_tss_rw);
-
- if (tifn & _TIF_IO_BITMAP) {
- /*
- * Copy the relevant range of the IO bitmap.
- * Normally this is 128 bytes or less:
- */
- memcpy(tss->io_bitmap, next->io_bitmap_ptr,
- max(prev->io_bitmap_max, next->io_bitmap_max));
- /*
- * Make sure that the TSS limit is correct for the CPU
- * to notice the IO bitmap.
- */
- refresh_tss_limit();
- } else if (tifp & _TIF_IO_BITMAP) {
- /*
- * Clear any possible leftover bits:
- */
- memset(tss->io_bitmap, 0xff, prev->io_bitmap_max);
+ /*
+ * Don't inherit TIF_SSBD across exec boundary when
+ * PR_SPEC_DISABLE_NOEXEC is used.
+ */
+ if (test_thread_flag(TIF_SSBD) &&
+ task_spec_ssb_noexec(current)) {
+ clear_thread_flag(TIF_SSBD);
+ task_clear_spec_ssb_disable(current);
+ task_clear_spec_ssb_noexec(current);
+ speculation_ctrl_update(task_thread_info(current)->flags);
}
}
+
+#ifdef CONFIG_X86_IOPL_IOPERM
+static inline void switch_to_bitmap(unsigned long tifp)
+{
+ /*
+ * Invalidate I/O bitmap if the previous task used it. This prevents
+ * any possible leakage of an active I/O bitmap.
+ *
+ * If the next task has an I/O bitmap it will handle it on exit to
+ * user mode.
+ */
+ if (tifp & _TIF_IO_BITMAP)
+ tss_invalidate_io_bitmap();
+}
+
+static void tss_copy_io_bitmap(struct tss_struct *tss, struct io_bitmap *iobm)
+{
+ /*
+ * Copy at least the byte range of the incoming tasks bitmap which
+ * covers the permitted I/O ports.
+ *
+ * If the previous task which used an I/O bitmap had more bits
+ * permitted, then the copy needs to cover those as well so they
+ * get turned off.
+ */
+ memcpy(tss->io_bitmap.bitmap, iobm->bitmap,
+ max(tss->io_bitmap.prev_max, iobm->max));
+
+ /*
+ * Store the new max and the sequence number of this bitmap
+ * and a pointer to the bitmap itself.
+ */
+ tss->io_bitmap.prev_max = iobm->max;
+ tss->io_bitmap.prev_sequence = iobm->sequence;
+}
+
+/**
+ * tss_update_io_bitmap - Update I/O bitmap before exiting to usermode
+ */
+void native_tss_update_io_bitmap(void)
+{
+ struct tss_struct *tss = this_cpu_ptr(&cpu_tss_rw);
+ struct thread_struct *t = ¤t->thread;
+ u16 *base = &tss->x86_tss.io_bitmap_base;
+
+ if (!test_thread_flag(TIF_IO_BITMAP)) {
+ native_tss_invalidate_io_bitmap();
+ return;
+ }
+
+ if (IS_ENABLED(CONFIG_X86_IOPL_IOPERM) && t->iopl_emul == 3) {
+ *base = IO_BITMAP_OFFSET_VALID_ALL;
+ } else {
+ struct io_bitmap *iobm = t->io_bitmap;
+
+ /*
+ * Only copy bitmap data when the sequence number differs. The
+ * update time is accounted to the incoming task.
+ */
+ if (tss->io_bitmap.prev_sequence != iobm->sequence)
+ tss_copy_io_bitmap(tss, iobm);
+
+ /* Enable the bitmap */
+ *base = IO_BITMAP_OFFSET_VALID_MAP;
+ }
+
+ /*
+ * Make sure that the TSS limit is covering the IO bitmap. It might have
+ * been cut down by a VMEXIT to 0x67 which would cause a subsequent I/O
+ * access from user space to trigger a #GP because tbe bitmap is outside
+ * the TSS limit.
+ */
+ refresh_tss_limit();
+}
+#else /* CONFIG_X86_IOPL_IOPERM */
+static inline void switch_to_bitmap(unsigned long tifp) { }
+#endif
#ifdef CONFIG_SMP
@@ -434,7 +573,7 @@
}
if (updmsr)
- wrmsrl(MSR_IA32_SPEC_CTRL, msr);
+ update_spec_ctrl_cond(msr);
}
static unsigned long speculation_ctrl_update_tif(struct task_struct *tsk)
@@ -472,17 +611,25 @@
preempt_enable();
}
+static inline void cr4_toggle_bits_irqsoff(unsigned long mask)
+{
+ unsigned long newval, cr4 = this_cpu_read(cpu_tlbstate.cr4);
+
+ newval = cr4 ^ mask;
+ if (newval != cr4) {
+ this_cpu_write(cpu_tlbstate.cr4, newval);
+ __write_cr4(newval);
+ }
+}
+
void __switch_to_xtra(struct task_struct *prev_p, struct task_struct *next_p)
{
- struct thread_struct *prev, *next;
unsigned long tifp, tifn;
-
- prev = &prev_p->thread;
- next = &next_p->thread;
tifn = READ_ONCE(task_thread_info(next_p)->flags);
tifp = READ_ONCE(task_thread_info(prev_p)->flags);
- switch_to_bitmap(prev, next, tifp, tifn);
+
+ switch_to_bitmap(tifp);
propagate_user_return_notify(prev_p, next_p);
@@ -512,6 +659,9 @@
/* Enforce MSR update to ensure consistent state */
__speculation_ctrl_update(~tifn, tifn);
}
+
+ if ((tifp ^ tifn) & _TIF_SLD)
+ switch_to_sld(tifn);
}
/*
@@ -553,11 +703,9 @@
*/
void __cpuidle default_idle(void)
{
- trace_cpu_idle_rcuidle(1, smp_processor_id());
- safe_halt();
- trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, smp_processor_id());
+ raw_safe_halt();
}
-#ifdef CONFIG_APM_MODULE
+#if defined(CONFIG_APM_MODULE) || defined(CONFIG_HALTPOLL_CPUIDLE_MODULE)
EXPORT_SYMBOL(default_idle);
#endif
@@ -572,7 +720,7 @@
}
#endif
-void stop_this_cpu(void *dummy)
+void __noreturn stop_this_cpu(void *dummy)
{
local_irq_disable();
/*
@@ -606,6 +754,8 @@
/*
* AMD Erratum 400 aware idle routine. We handle it the same way as C3 power
* states (local apic timer and TSC stop).
+ *
+ * XXX this function is completely buggered vs RCU and tracing.
*/
static void amd_e400_idle(void)
{
@@ -627,9 +777,9 @@
* The switch back from broadcast mode needs to be called with
* interrupts disabled.
*/
- local_irq_disable();
+ raw_local_irq_disable();
tick_broadcast_exit();
- local_irq_enable();
+ raw_local_irq_enable();
}
/*
@@ -644,10 +794,14 @@
*/
static int prefer_mwait_c1_over_halt(const struct cpuinfo_x86 *c)
{
+ /* User has disallowed the use of MWAIT. Fallback to HALT */
+ if (boot_option_idle_override == IDLE_NOMWAIT)
+ return 0;
+
if (c->x86_vendor != X86_VENDOR_INTEL)
return 0;
- if (!cpu_has(c, X86_FEATURE_MWAIT) || static_cpu_has_bug(X86_BUG_MONITOR))
+ if (!cpu_has(c, X86_FEATURE_MWAIT) || boot_cpu_has_bug(X86_BUG_MONITOR))
return 0;
return 1;
@@ -661,7 +815,6 @@
static __cpuidle void mwait_idle(void)
{
if (!current_set_polling_and_test()) {
- trace_cpu_idle_rcuidle(1, smp_processor_id());
if (this_cpu_has(X86_BUG_CLFLUSH_MONITOR)) {
mb(); /* quirk */
clflush((void *)¤t_thread_info()->flags);
@@ -672,10 +825,9 @@
if (!need_resched())
__sti_mwait(0, 0);
else
- local_irq_enable();
- trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, smp_processor_id());
+ raw_local_irq_enable();
} else {
- local_irq_enable();
+ raw_local_irq_enable();
}
__current_clr_polling();
}
@@ -754,9 +906,8 @@
} else if (!strcmp(str, "nomwait")) {
/*
* If the boot option of "idle=nomwait" is added,
- * it means that mwait will be disabled for CPU C2/C3
- * states. In such case it won't touch the variable
- * of boot_option_idle_override.
+ * it means that mwait will be disabled for CPU C1/C2/C3
+ * states.
*/
boot_option_idle_override = IDLE_NOMWAIT;
} else
@@ -789,7 +940,7 @@
unsigned long start, bottom, top, sp, fp, ip, ret = 0;
int count = 0;
- if (!p || p == current || p->state == TASK_RUNNING)
+ if (p == current || p->state == TASK_RUNNING)
return 0;
if (!try_get_task_stack(p))
--
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