/** @brief C entry point */
void mb_entry(mbinfo_t *info, void *istack) {
int argc;
char **argv;
char **envp;
/* 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);
}
int kernel_main()
{
/*
* Tell the kernel memory allocator which memory it can't use.
* It already knows not to touch kernel image.
*/
lmm_remove_free( &malloc_lmm, (void*)USER_MEM_START, USER_MEM_SIZE );
lmm_remove_free( &malloc_lmm, (void*)0, 0x100000 );
/*
* Initialize drivers here.
*/
driver_init();
/*
* initialize the PIC so that IRQs and
* exception handlers don't overlap in the IDT.
*/
pic_init( BASE_IRQ_MASTER_BASE, BASE_IRQ_SLAVE_BASE );
/* This is all up to you... */
return -1;
}
/*
* XXX there is no single point at which I can intercept memory allocations
* by OSKit routines. LMM routines are called directly on malloc_lmm in a
* number of places in the OSKit libraries.
*
* So, we just drain the LMM at boot time and then override morecore.
* This will force either a panic, or a call to morecore when an attempt
* to allocate memory is made.
*/
static void
drain_lmm(void)
{
extern oskit_addr_t phys_mem_max;
extern lmm_t malloc_lmm;
lmm_remove_free(&malloc_lmm, 0, phys_mem_max);
}
/* --- Kernel entrypoint --- */
int
kernel_main()
{
/*
* Tell the kernel memory allocator which memory it can't use.
* It already knows not to touch kernel image.
*/
/* Everything above 16M */
lmm_remove_free( &malloc_lmm, (void*)USER_MEM_START, -8 - USER_MEM_START );
/* Everything below 1M */
lmm_remove_free( &malloc_lmm, (void*)0, 0x100000 );
if(handler_install() < 0) {
return 0;
}
/*
* initialize the PIC so that IRQs and
* exception handlers don't overlap in the IDT.
*/
pic_init( BASE_IRQ_MASTER_BASE, BASE_IRQ_SLAVE_BASE );
clear_console();
show_cursor();
set_term_color(FGND_GREEN | BGND_BLACK);
set_cursor(12, 34);
putbytes("Hello World!\n", 13);
while(1) {
}
return 0;
}
/** @brief Kernel entrypoint.
*
* This is the entrypoint for the kernel. It simply sets up the
* drivers and passes control off to game_run().
*
* @return Does not return
*/
int kernel_main()
{
/*
* Tell the kernel memory allocator which memory it can't use.
* It already knows not to touch kernel image.
*/
/* Everything above 16M */
lmm_remove_free( &malloc_lmm, (void*)USER_MEM_START, -8 - USER_MEM_START );
/* Everything below 1M */
lmm_remove_free( &malloc_lmm, (void*)0, 0x100000 );
/*
* Install interrupt handlers here.
*/
handler_install(tick);
/*
* initialize the PIC so that IRQs and
* exception handlers don't overlap in the IDT.
*/
pic_init( BASE_IRQ_MASTER_BASE, BASE_IRQ_SLAVE_BASE );
/*
* allow all interrupts
*/
enable_interrupts();
/*
* run the game
*/
game_run();
return 0;
}
