u_int
initarm(void *arg)
{
#ifdef MEMSIZE
psize_t memsize = (unsigned) MEMSIZE * 1024 * 1024;
#else
/* If MEMSIZE is not defined, use QEMU's default value (128 MB) */
psize_t memsize = (unsigned) 128 * 1024 * 1024;
#endif
pmap_devmap_register(vexpress_devmap);
set_cpufuncs();
consinit();
/* Talk to the user */
#define BDSTR(s) _BDSTR(s)
#define _BDSTR(s) #s
printf("\nNetBSD/evbarm (" BDSTR(EVBARM_BOARDTYPE) ") booting ...\n");
#ifdef VERBOSE_INIT_ARM
printf("initarm: cbar=%#x\n", armreg_cbar_read());
#endif
bootconfig.dramblocks = 1;
bootconfig.dram[0].address = KERN_VTOPHYS(KERNEL_BASE);
bootconfig.dram[0].pages = memsize / PAGE_SIZE;
arm32_bootmem_init(bootconfig.dram[0].address, memsize,
(uintptr_t) KERNEL_BASE_phys);
arm32_kernel_vm_init(KERNEL_VM_BASE, ARM_VECTORS_HIGH, 0, vexpress_devmap,
true);
#ifdef VERBOSE_INIT_ARM
printf("initarm: Configuring system ...\n");
#endif
cortex_pmc_ccnt_init();
/* We've a specific device_register routine */
evbarm_device_register = vexpress_device_register;
return initarm_common(KERNEL_VM_BASE, KERNEL_VM_SIZE, NULL, 0);
}
static void
setup_real_page_tables(void)
{
/*
* We need to allocate some fixed page tables to get the kernel going.
*
* We are going to allocate our bootstrap pages from the beginning of
* the free space that we just calculated. We allocate one page
* directory and a number of page tables and store the physical
* addresses in the kernel_pt_table array.
*
* The kernel page directory must be on a 16K boundary. The page
* tables must be on 4K boundaries. What we do is allocate the
* page directory on the first 16K boundary that we encounter, and
* the page tables on 4K boundaries otherwise. Since we allocate
* at least 3 L2 page tables, we are guaranteed to encounter at
* least one 16K aligned region.
*/
#ifdef VERBOSE_INIT_ARM
printf("Allocating page tables\n");
#endif
/*
* Define a macro to simplify memory allocation. As we allocate the
* memory, make sure that we don't walk over our temporary first level
* translation table.
*/
#define valloc_pages(var, np) \
(var).pv_pa = physical_freestart; \
physical_freestart += ((np) * PAGE_SIZE); \
if (physical_freestart > (physical_freeend - L1_TABLE_SIZE)) \
panic("initarm: out of memory"); \
free_pages -= (np); \
(var).pv_va = KERN_PHYSTOV((var).pv_pa); \
memset((char *)(var).pv_va, 0, ((np) * PAGE_SIZE));
int loop, pt_index;
pt_index = 0;
kernel_l1pt.pv_pa = 0;
kernel_l1pt.pv_va = 0;
for (loop = 0; loop <= NUM_KERNEL_PTS; ++loop) {
/* Are we 16KB aligned for an L1 ? */
if ((physical_freestart & (L1_TABLE_SIZE - 1)) == 0
&& kernel_l1pt.pv_pa == 0) {
valloc_pages(kernel_l1pt, L1_TABLE_SIZE / PAGE_SIZE);
} else {
valloc_pages(kernel_pt_table[pt_index],
L2_TABLE_SIZE / PAGE_SIZE);
++pt_index;
}
}
/* This should never be able to happen but better confirm that. */
if (!kernel_l1pt.pv_pa || (kernel_l1pt.pv_pa & (L1_TABLE_SIZE-1)) != 0)
panic("initarm: Failed to align the kernel page directory");
/*
* Allocate a page for the system page mapped to V0x00000000
* This page will just contain the system vectors and can be
* shared by all processes.
*/
valloc_pages(systempage, 1);
systempage.pv_va = 0x00000000;
/* Allocate stacks for all modes */
valloc_pages(irqstack, IRQ_STACK_SIZE);
valloc_pages(abtstack, ABT_STACK_SIZE);
valloc_pages(undstack, UND_STACK_SIZE);
valloc_pages(kernelstack, UPAGES);
/* Allocate the message buffer. */
pv_addr_t msgbuf;
int msgbuf_pgs = round_page(MSGBUFSIZE) / PAGE_SIZE;
valloc_pages(msgbuf, msgbuf_pgs);
msgbufphys = msgbuf.pv_pa;
/*
* Ok we have allocated physical pages for the primary kernel
* page tables
*/
#ifdef VERBOSE_INIT_ARM
printf("Creating L1 page table at 0x%08lx\n", kernel_l1pt.pv_pa);
#endif
/*
* Now we start construction of the L1 page table
* We start by mapping the L2 page tables into the L1.
* This means that we can replace L1 mappings later on if necessary
*/
vaddr_t l1_va = kernel_l1pt.pv_va;
paddr_t l1_pa = kernel_l1pt.pv_pa;
/* Map the L2 pages tables in the L1 page table */
pmap_link_l2pt(l1_va, 0x00000000, &kernel_pt_table[KERNEL_PT_SYS]);
for (loop = 0; loop < KERNEL_PT_KERNEL_NUM; loop++)
pmap_link_l2pt(l1_va, KERNEL_BASE + loop * 0x00400000,
&kernel_pt_table[KERNEL_PT_KERNEL + loop]);
for (loop = 0; loop < KERNEL_PT_VMDATA_NUM; loop++)
pmap_link_l2pt(l1_va, KERNEL_VM_BASE + loop * 0x00400000,
&kernel_pt_table[KERNEL_PT_VMDATA + loop]);
/* update the top of the kernel VM */
pmap_curmaxkvaddr =
KERNEL_VM_BASE + (KERNEL_PT_VMDATA_NUM * 0x00400000);
#ifdef VERBOSE_INIT_ARM
printf("Mapping kernel\n");
#endif
/* Now we fill in the L2 pagetable for the kernel static code/data */
size_t textsize = round_page((uintptr_t) etext - KERNEL_BASE);
size_t totalsize = round_page((uintptr_t) _end - KERNEL_BASE);
u_int offset = 0; /* offset of kernel in RAM */
/* Map text section read-only. */
offset += pmap_map_chunk(l1_va, KERNEL_BASE + offset,
physical_start + offset, textsize,
VM_PROT_READ, PTE_CACHE);
/* Map data and bss sections read-write. */
offset += pmap_map_chunk(l1_va, KERNEL_BASE + offset,
physical_start + offset, totalsize - textsize,
VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
#ifdef VERBOSE_INIT_ARM
printf("Constructing L2 page tables\n");
#endif
/* Map the stack pages */
pmap_map_chunk(l1_va, irqstack.pv_va, irqstack.pv_pa,
IRQ_STACK_SIZE * PAGE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
pmap_map_chunk(l1_va, abtstack.pv_va, abtstack.pv_pa,
ABT_STACK_SIZE * PAGE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
pmap_map_chunk(l1_va, undstack.pv_va, undstack.pv_pa,
UND_STACK_SIZE * PAGE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
pmap_map_chunk(l1_va, kernelstack.pv_va, kernelstack.pv_pa,
UPAGES * PAGE_SIZE, VM_PROT_READ | VM_PROT_WRITE, PTE_CACHE);
pmap_map_chunk(l1_va, kernel_l1pt.pv_va, kernel_l1pt.pv_pa,
L1_TABLE_SIZE, VM_PROT_READ | VM_PROT_WRITE, PTE_PAGETABLE);
for (loop = 0; loop < NUM_KERNEL_PTS; ++loop) {
pmap_map_chunk(l1_va, kernel_pt_table[loop].pv_va,
kernel_pt_table[loop].pv_pa, L2_TABLE_SIZE,
VM_PROT_READ|VM_PROT_WRITE, PTE_PAGETABLE);
}
/* Map the vector page. */
pmap_map_entry(l1_va, ARM_VECTORS_LOW, systempage.pv_pa,
VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
/*
* Map integrated peripherals at same address in first level page
* table so that we can continue to use console.
*/
pmap_devmap_bootstrap(l1_va, devmap);
#ifdef VERBOSE_INIT_ARM
/* Tell the user about where all the bits and pieces live. */
printf("%22s Physical Virtual Num\n", " ");
printf("%22s Starting Ending Starting Ending Pages\n", " ");
static const char mem_fmt[] =
"%20s: 0x%08lx 0x%08lx 0x%08lx 0x%08lx %d\n";
static const char mem_fmt_nov[] =
"%20s: 0x%08lx 0x%08lx %d\n";
printf(mem_fmt, "SDRAM", physical_start, physical_end-1,
KERN_PHYSTOV(physical_start), KERN_PHYSTOV(physical_end-1),
physmem);
printf(mem_fmt, "text section",
KERN_VTOPHYS(KERNEL_BASE), KERN_VTOPHYS(etext-1),
(vaddr_t)KERNEL_BASE, (vaddr_t)etext-1,
(int)(textsize / PAGE_SIZE));
printf(mem_fmt, "data section",
KERN_VTOPHYS(__data_start), KERN_VTOPHYS(_edata),
(vaddr_t)__data_start, (vaddr_t)_edata,
(int)((round_page((vaddr_t)_edata)
- trunc_page((vaddr_t)__data_start)) / PAGE_SIZE));
printf(mem_fmt, "bss section",
KERN_VTOPHYS(__bss_start), KERN_VTOPHYS(__bss_end__),
(vaddr_t)__bss_start, (vaddr_t)__bss_end__,
(int)((round_page((vaddr_t)__bss_end__)
- trunc_page((vaddr_t)__bss_start)) / PAGE_SIZE));
printf(mem_fmt, "L1 page directory",
kernel_l1pt.pv_pa, kernel_l1pt.pv_pa + L1_TABLE_SIZE - 1,
kernel_l1pt.pv_va, kernel_l1pt.pv_va + L1_TABLE_SIZE - 1,
L1_TABLE_SIZE / PAGE_SIZE);
printf(mem_fmt, "Exception Vectors",
systempage.pv_pa, systempage.pv_pa + PAGE_SIZE - 1,
(vaddr_t)ARM_VECTORS_LOW, (vaddr_t)ARM_VECTORS_LOW + PAGE_SIZE - 1,
1);
printf(mem_fmt, "IRQ stack",
irqstack.pv_pa, irqstack.pv_pa + (IRQ_STACK_SIZE * PAGE_SIZE) - 1,
irqstack.pv_va, irqstack.pv_va + (IRQ_STACK_SIZE * PAGE_SIZE) - 1,
IRQ_STACK_SIZE);
printf(mem_fmt, "ABT stack",
abtstack.pv_pa, abtstack.pv_pa + (ABT_STACK_SIZE * PAGE_SIZE) - 1,
abtstack.pv_va, abtstack.pv_va + (ABT_STACK_SIZE * PAGE_SIZE) - 1,
ABT_STACK_SIZE);
printf(mem_fmt, "UND stack",
undstack.pv_pa, undstack.pv_pa + (UND_STACK_SIZE * PAGE_SIZE) - 1,
undstack.pv_va, undstack.pv_va + (UND_STACK_SIZE * PAGE_SIZE) - 1,
UND_STACK_SIZE);
printf(mem_fmt, "SVC stack",
kernelstack.pv_pa, kernelstack.pv_pa + (UPAGES * PAGE_SIZE) - 1,
kernelstack.pv_va, kernelstack.pv_va + (UPAGES * PAGE_SIZE) - 1,
UPAGES);
printf(mem_fmt_nov, "Message Buffer",
msgbufphys, msgbufphys + msgbuf_pgs * PAGE_SIZE - 1, msgbuf_pgs);
printf(mem_fmt, "Free Memory", physical_freestart, physical_freeend-1,
KERN_PHYSTOV(physical_freestart), KERN_PHYSTOV(physical_freeend-1),
free_pages);
#endif
/*
* Now we have the real page tables in place so we can switch to them.
* Once this is done we will be running with the REAL kernel page
* tables.
*/
/* Switch tables */
#ifdef VERBOSE_INIT_ARM
printf("switching to new L1 page table @%#lx...", l1_pa);
#endif
cpu_domains((DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL*2)) | DOMAIN_CLIENT);
setttb(l1_pa);
cpu_tlb_flushID();
cpu_domains(DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL*2));
}
/*
* u_int initarm(...)
*
* Initial entry point on startup. This gets called before main() is
* entered.
* It should be responsible for setting up everything that must be
* in place when main is called.
* This includes
* Taking a copy of the boot configuration structure.
* Initialising the physical console so characters can be printed.
* Setting up page tables for the kernel
* Relocating the kernel to the bottom of physical memory
*/
u_int
initarm(void *arg)
{
/*
* When we enter here, we are using a temporary first level
* translation table with section entries in it to cover the TIPB
* peripherals and SDRAM. The temporary first level translation table
* is at the end of SDRAM.
*/
/* Heads up ... Setup the CPU / MMU / TLB functions. */
if (set_cpufuncs())
panic("cpu not recognized!");
init_clocks();
/* The console is going to try to map things. Give pmap a devmap. */
pmap_devmap_register(devmap);
consinit();
#ifdef KGDB
kgdb_port_init();
#endif
#ifdef VERBOSE_INIT_ARM
/* Talk to the user */
printf("\nNetBSD/evbarm (OSK5912) booting ...\n");
#endif
#ifdef BOOT_ARGS
char mi_bootargs[] = BOOT_ARGS;
parse_mi_bootargs(mi_bootargs);
#endif
#ifdef VERBOSE_INIT_ARM
printf("initarm: Configuring system ...\n");
#endif
/*
* Set up the variables that define the availability of physical
* memory.
*/
physical_start = KERNEL_BASE_PHYS;
physical_end = physical_start + MEMSIZE_BYTES;
physmem = MEMSIZE_BYTES / PAGE_SIZE;
/* Fake bootconfig structure for the benefit of pmap.c. */
bootconfig.dramblocks = 1;
bootconfig.dram[0].address = physical_start;
bootconfig.dram[0].pages = physmem;
/*
* Our kernel is at the beginning of memory, so set our free space to
* all the memory after the kernel.
*/
physical_freestart = KERN_VTOPHYS(round_page((vaddr_t) _end));
physical_freeend = physical_end;
free_pages = (physical_freeend - physical_freestart) / PAGE_SIZE;
/*
* This is going to do all the hard work of setting up the first and
* and second level page tables. Pages of memory will be allocated
* and mapped for other structures that are required for system
* operation. When it returns, physical_freestart and free_pages will
* have been updated to reflect the allocations that were made. In
* addition, kernel_l1pt, kernel_pt_table[], systempage, irqstack,
* abtstack, undstack, kernelstack, msgbufphys will be set to point to
* the memory that was allocated for them.
*/
setup_real_page_tables();
/*
* Moved from cpu_startup() as data_abort_handler() references
* this during uvm init.
*/
proc0paddr = (struct user *)kernelstack.pv_va;
lwp0.l_addr = proc0paddr;
#ifdef VERBOSE_INIT_ARM
printf("bootstrap done.\n");
#endif
arm32_vector_init(ARM_VECTORS_LOW, ARM_VEC_ALL);
/*
* Pages were allocated during the secondary bootstrap for the
* stacks for different CPU modes.
* We must now set the r13 registers in the different CPU modes to
* point to these stacks.
* Since the ARM stacks use STMFD etc. we must set r13 to the top end
* of the stack memory.
*/
#ifdef VERBOSE_INIT_ARM
printf("init subsystems: stacks ");
#endif
set_stackptr(PSR_IRQ32_MODE, irqstack.pv_va + IRQ_STACK_SIZE * PAGE_SIZE);
set_stackptr(PSR_ABT32_MODE, abtstack.pv_va + ABT_STACK_SIZE * PAGE_SIZE);
set_stackptr(PSR_UND32_MODE, undstack.pv_va + UND_STACK_SIZE * PAGE_SIZE);
/*
* Well we should set a data abort handler.
* Once things get going this will change as we will need a proper
* handler.
* Until then we will use a handler that just panics but tells us
* why.
* Initialisation of the vectors will just panic on a data abort.
* This just fills in a slightly better one.
*/
#ifdef VERBOSE_INIT_ARM
printf("vectors ");
#endif
data_abort_handler_address = (u_int)data_abort_handler;
prefetch_abort_handler_address = (u_int)prefetch_abort_handler;
undefined_handler_address = (u_int)undefinedinstruction_bounce;
/* Initialise the undefined instruction handlers */
#ifdef VERBOSE_INIT_ARM
printf("undefined ");
#endif
undefined_init();
/* Load memory into UVM. */
#ifdef VERBOSE_INIT_ARM
printf("page ");
#endif
uvm_setpagesize(); /* initialize PAGE_SIZE-dependent variables */
uvm_page_physload(atop(physical_freestart), atop(physical_freeend),
atop(physical_freestart), atop(physical_freeend),
VM_FREELIST_DEFAULT);
/* Boot strap pmap telling it where the kernel page table is */
#ifdef VERBOSE_INIT_ARM
printf("pmap ");
#endif
pmap_bootstrap(KERNEL_VM_BASE, KERNEL_VM_BASE + KERNEL_VM_SIZE);
#ifdef VERBOSE_INIT_ARM
printf("done.\n");
#endif
#ifdef KGDB
if (boothowto & RB_KDB) {
kgdb_debug_init = 1;
kgdb_connect(1);
}
#endif
#ifdef DDB
db_machine_init();
/* Firmware doesn't load symbols. */
ddb_init(0, NULL, NULL);
if (boothowto & RB_KDB)
Debugger();
#endif
/* We return the new stack pointer address */
return(kernelstack.pv_va + USPACE_SVC_STACK_TOP);
}
