![Paul Jackson](/assets/img/avatar_default.png)
The map size counter passed into, and back out of, sanitize_e820_map(), was an eight bit type (char or u8), as derived from its origins in legacy BIOS E820 structures. This patch changes that type to an 'int', to allow this sanitize routine to also be used on larger maps (larger than the 256 count that fits in a char). The legacy BIOS E820 interface of course does not change; that remains at 8 bits for this count, holding up to E820MAX == 128 entries. But the kernel internals can handle more when those additional memory map entries are passed from the BIOS via EFI interfaces. Signed-off-by: Paul Jackson <pj@sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
192 lines
4.4 KiB
C
192 lines
4.4 KiB
C
/*
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* Machine specific setup for generic
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*/
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#include <linux/smp.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <asm/acpi.h>
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#include <asm/arch_hooks.h>
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#include <asm/e820.h>
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#include <asm/setup.h>
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#ifdef CONFIG_HOTPLUG_CPU
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#define DEFAULT_SEND_IPI (1)
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#else
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#define DEFAULT_SEND_IPI (0)
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#endif
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int no_broadcast=DEFAULT_SEND_IPI;
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/**
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* pre_intr_init_hook - initialisation prior to setting up interrupt vectors
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*
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* Description:
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* Perform any necessary interrupt initialisation prior to setting up
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* the "ordinary" interrupt call gates. For legacy reasons, the ISA
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* interrupts should be initialised here if the machine emulates a PC
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* in any way.
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**/
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void __init pre_intr_init_hook(void)
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{
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init_ISA_irqs();
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}
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/*
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* IRQ2 is cascade interrupt to second interrupt controller
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*/
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static struct irqaction irq2 = {
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.handler = no_action,
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.mask = CPU_MASK_NONE,
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.name = "cascade",
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};
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/**
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* intr_init_hook - post gate setup interrupt initialisation
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*
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* Description:
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* Fill in any interrupts that may have been left out by the general
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* init_IRQ() routine. interrupts having to do with the machine rather
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* than the devices on the I/O bus (like APIC interrupts in intel MP
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* systems) are started here.
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**/
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void __init intr_init_hook(void)
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{
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#ifdef CONFIG_X86_LOCAL_APIC
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apic_intr_init();
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#endif
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if (!acpi_ioapic)
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setup_irq(2, &irq2);
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}
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/**
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* pre_setup_arch_hook - hook called prior to any setup_arch() execution
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*
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* Description:
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* generally used to activate any machine specific identification
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* routines that may be needed before setup_arch() runs. On VISWS
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* this is used to get the board revision and type.
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**/
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void __init pre_setup_arch_hook(void)
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{
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}
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/**
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* trap_init_hook - initialise system specific traps
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*
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* Description:
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* Called as the final act of trap_init(). Used in VISWS to initialise
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* the various board specific APIC traps.
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**/
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void __init trap_init_hook(void)
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{
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}
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static struct irqaction irq0 = {
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.handler = timer_interrupt,
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.flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_IRQPOLL,
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.mask = CPU_MASK_NONE,
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.name = "timer"
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};
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/**
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* time_init_hook - do any specific initialisations for the system timer.
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*
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* Description:
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* Must plug the system timer interrupt source at HZ into the IRQ listed
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* in irq_vectors.h:TIMER_IRQ
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**/
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void __init time_init_hook(void)
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{
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irq0.mask = cpumask_of_cpu(0);
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setup_irq(0, &irq0);
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}
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#ifdef CONFIG_MCA
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/**
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* mca_nmi_hook - hook into MCA specific NMI chain
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*
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* Description:
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* The MCA (Microchannel Architecture) has an NMI chain for NMI sources
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* along the MCA bus. Use this to hook into that chain if you will need
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* it.
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**/
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void mca_nmi_hook(void)
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{
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/* If I recall correctly, there's a whole bunch of other things that
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* we can do to check for NMI problems, but that's all I know about
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* at the moment.
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*/
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printk("NMI generated from unknown source!\n");
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}
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#endif
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static __init int no_ipi_broadcast(char *str)
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{
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get_option(&str, &no_broadcast);
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printk ("Using %s mode\n", no_broadcast ? "No IPI Broadcast" :
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"IPI Broadcast");
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return 1;
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}
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__setup("no_ipi_broadcast=", no_ipi_broadcast);
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static int __init print_ipi_mode(void)
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{
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printk ("Using IPI %s mode\n", no_broadcast ? "No-Shortcut" :
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"Shortcut");
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return 0;
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}
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late_initcall(print_ipi_mode);
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/**
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* machine_specific_memory_setup - Hook for machine specific memory setup.
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*
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* Description:
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* This is included late in kernel/setup.c so that it can make
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* use of all of the static functions.
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**/
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char * __init machine_specific_memory_setup(void)
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{
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char *who;
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int new_nr;
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who = "BIOS-e820";
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/*
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* Try to copy the BIOS-supplied E820-map.
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*
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* Otherwise fake a memory map; one section from 0k->640k,
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* the next section from 1mb->appropriate_mem_k
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*/
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new_nr = boot_params.e820_entries;
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sanitize_e820_map(boot_params.e820_map,
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ARRAY_SIZE(boot_params.e820_map),
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&new_nr);
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boot_params.e820_entries = new_nr;
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if (copy_e820_map(boot_params.e820_map, boot_params.e820_entries)
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< 0) {
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unsigned long mem_size;
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/* compare results from other methods and take the greater */
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if (boot_params.alt_mem_k
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< boot_params.screen_info.ext_mem_k) {
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mem_size = boot_params.screen_info.ext_mem_k;
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who = "BIOS-88";
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} else {
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mem_size = boot_params.alt_mem_k;
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who = "BIOS-e801";
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}
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e820.nr_map = 0;
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add_memory_region(0, LOWMEMSIZE(), E820_RAM);
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add_memory_region(HIGH_MEMORY, mem_size << 10, E820_RAM);
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}
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return who;
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}
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