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/** @file boot/entry.c
* @brief Entry point for the C part of the kernel
* @author matthewj S2008
* @author elly1 S2010
*/
#include <common_kern.h>
#include <x86/cr.h>
#include <x86/page.h>
#include <x86/interrupt_defines.h>
#include <boot/multiboot.h>
#include <boot/util.h>
#include <simics.h>
#include <lmm/lmm.h>
#include <malloc/malloc_internal.h>
#include <assert.h>
#include <kvmphys.h>
/* For FLUX compatibility; see lib/kvmphys.h */
vm_offset_t phys_mem_va = 0;
/* 410 interface compatibility */
static int n_phys_frames = 0;
/** @brief C entry point */
void mb_entry(mbinfo_t *info, void *istack) {
int argc;
char **argv;
char **envp;
/* Make sure mem_upper has been set by boot loader */
assert(info->flags & MULTIBOOT_MEMORY);
/* Want (kilobytes*1024)/PAGE_SIZE, but definitely avoid overflow */
n_phys_frames = (info->mem_upper+1024)/(PAGE_SIZE/1024);
assert(n_phys_frames > (USER_MEM_START/PAGE_SIZE));
// LMM: init malloc_lmm and reserve memory holding this executable
mb_util_lmm(info, &malloc_lmm);
// LMM: don't give out memory under 1 megabyte
lmm_remove_free(&malloc_lmm, (void*)0, 0x100000);
// LMM: don't give out memory between USER_MEM_START and infinity
lmm_remove_free(&malloc_lmm, (void*)USER_MEM_START, -8 - USER_MEM_START);
// lmm_dump(&malloc_lmm);
mb_util_cmdline(info, &argc, &argv, &envp);
// Having done that, let's tell Simics we've booted.
sim_booted(argv[0]);
/* Disable floating-point unit:
* inadvisable for kernel, requires context-switch code for users
*/
set_cr0(get_cr0() | CR0_EM);
/* Initialize the PIC so that IRQs use different IDT slots than
* CPU-defined exceptions.
*/
interrupt_setup();
kernel_main(info, argc, argv, envp);
}
#include <lmm/lmm_types.h>
static int hv_guest_mode = 0;
static unsigned int hv_max_vaddr = 0;
/** @brief guest-mode C entry point */
void hv_guest_entry(unsigned int maxframe, unsigned int maxvaddr) {
char *argv[] = { "kernel", "-guest", 0} ;
n_phys_frames = maxframe - 4 + 1; /* XXX */
assert(n_phys_frames > (USER_MEM_START/PAGE_SIZE));
// LMM init, short form
static struct lmm_region region;
extern char end[];
lmm_init(&malloc_lmm);
lmm_add_region(&malloc_lmm, ®ion, 0, USER_MEM_START, 0, 1); // kvm
lmm_add_free(&malloc_lmm, end, (char *)USER_MEM_START - end); // available kvm
hv_max_vaddr = maxvaddr;
hv_guest_mode = 1;
kernel_main(0, 2, argv, 0);
}
int hv_isguest(void)
{
return (hv_guest_mode);
}
void *
hv_maxvaddr(void)
{
if (!hv_guest_mode)
panic("hv_maxvaddr() called in host mode");
return ((void *)hv_max_vaddr);
}
int
machine_phys_frames(void)
{
return (n_phys_frames);
}
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