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| author |  H. Peter Anvin (Intel) <hpa@zytor.com>
| 2023-12-05 02:50:23 -0800 |
|---|---|---|
| committer |  Borislav Petkov (AMD) <bp@alien8.de>
| 2024-01-31 22:03:32 +0100 |
| commit | cdd99dd873cb11c40adf1ef70693f72c622ac8f3 (patch) | |
| tree | f297f74ee97f35c362b2bc8b13326023a0bb9871 /arch/x86/entry | |
| parent | x86/syscall: Split IDT syscall setup code into idt_syscall_init() (diff) | |
| download | linux-cdd99dd873cb11c40adf1ef70693f72c622ac8f3.tar.gz linux-cdd99dd873cb11c40adf1ef70693f72c622ac8f3.tar.bz2 linux-cdd99dd873cb11c40adf1ef70693f72c622ac8f3.zip | |
x86/fred: Add FRED initialization functions
Add cpu_init_fred_exceptions() to:
- Set FRED entrypoints for events happening in ring 0 and 3.
- Specify the stack level for IRQs occurred ring 0.
- Specify dedicated event stacks for #DB/NMI/#MCE/#DF.
- Enable FRED and invalidtes IDT.
- Force 32-bit system calls to use "int $0x80" only.
Add fred_complete_exception_setup() to:
- Initialize system_vectors as done for IDT systems.
- Set unused sysvec_table entries to fred_handle_spurious_interrupt().
Co-developed-by: Xin Li <xin3.li@intel.com>
Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Signed-off-by: Xin Li <xin3.li@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Tested-by: Shan Kang <shan.kang@intel.com>
Link: https://lore.kernel.org/r/20231205105030.8698-35-xin3.li@intel.com
Diffstat (limited to 'arch/x86/entry')
| -rw-r--r-- | arch/x86/entry/entry_fred.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/x86/entry/entry_fred.c b/arch/x86/entry/entry_fred.c index 6ecc08b6d72a..ac120cbdaaf2 100644 --- a/arch/x86/entry/entry_fred.c +++ b/arch/x86/entry/entry_fred.c @@ -133,6 +133,27 @@ void __init fred_install_sysvec(unsigned int sysvec, idtentry_t handler) sysvec_table[sysvec - FIRST_SYSTEM_VECTOR] = handler; } +static noinstr void fred_handle_spurious_interrupt(struct pt_regs *regs) +{ + spurious_interrupt(regs, regs->fred_ss.vector); +} + +void __init fred_complete_exception_setup(void) +{ + unsigned int vector; + + for (vector = 0; vector < FIRST_EXTERNAL_VECTOR; vector++) + set_bit(vector, system_vectors); + + for (vector = 0; vector < NR_SYSTEM_VECTORS; vector++) { + if (sysvec_table[vector]) + set_bit(vector + FIRST_SYSTEM_VECTOR, system_vectors); + else + sysvec_table[vector] = fred_handle_spurious_interrupt; + } + fred_setup_done = true; +} + static noinstr void fred_extint(struct pt_regs *regs) { unsigned int vector = regs->fred_ss.vector; |