int checkboard(void)
{
puts("Board: iMX8QM MEK\n");
build_info();
print_bootinfo();
return 0;
}
static void _sos_init(seL4_CPtr* ipc_ep, seL4_CPtr* async_ep){
seL4_Word dma_addr;
seL4_Word low, high;
int err;
/* Retrieve boot info from seL4 */
_boot_info = seL4_GetBootInfo();
conditional_panic(!_boot_info, "Failed to retrieve boot info\n");
if(verbose > 0){
print_bootinfo(_boot_info);
}
/* Initialise the untyped sub system and reserve memory for DMA */
err = ut_table_init(_boot_info);
conditional_panic(err, "Failed to initialise Untyped Table\n");
/* DMA uses a large amount of memory that will never be freed */
dma_addr = ut_steal_mem(DMA_SIZE_BITS);
conditional_panic(dma_addr == 0, "Failed to reserve DMA memory\n");
/* find available memory */
ut_find_memory(&low, &high);
/* Initialise the untyped memory allocator */
ut_allocator_init(low, high);
/* Initialise the cspace manager */
err = cspace_root_task_bootstrap(ut_alloc, ut_free, ut_translate,
malloc, free);
conditional_panic(err, "Failed to initialise the c space\n");
/* Initialise DMA memory */
err = dma_init(dma_addr, DMA_SIZE_BITS);
conditional_panic(err, "Failed to intiialise DMA memory\n");
/* Initialise IPC */
_sos_ipc_init(ipc_ep, async_ep);
/* Initialise frame table */
err = frame_init();
conditional_panic(err, "Failed to initialise frame table\n");
}
int main(void)
{
int error;
/* give us a name: useful for debugging if the thread faults */
name_thread(seL4_CapInitThreadTCB, "hello-2");
/* get boot info */
info = seL4_GetBootInfo();
/* print out bootinfo */
print_bootinfo(info);
/* get our cspace root cnode */
seL4_CPtr cspace_cap;
//cspace_cap = simple_get_cnode(&simple);
cspace_cap = seL4_CapInitThreadCNode;
/* get our vspace root page diretory */
seL4_CPtr pd_cap;
pd_cap = seL4_CapInitThreadPD;
seL4_CPtr tcb_cap;
/* TODO 1: Set tcb_cap to a free cap slot index.
* hint: The bootinfo struct contains a range of free cap slot indices.
*/
seL4_CPtr untyped;
/* TODO 2: Obtain a cap to an untyped which is large enough to contain a tcb.
*
* hint 1: determine the size of a tcb object.
* (look in libs/libsel4/arch_include/x86/sel4/arch/types.h)
* hint 2: an array of untyped caps, and a corresponding array of untyped sizes
* can be found in the bootinfo struct
*/
/* TODO 3: Retype the untyped into a tcb, storing a cap in tcb_cap
*
* hint 1: int seL4_Untyped_Retype(seL4_Untyped service, int type, int size_bits, seL4_CNode root, int node_index, int node_depth, int node_offset, int num_objects)
* hint 2: use a depth of 32
* hint 3: use cspace_cap for the root cnode AND the cnode_index
* (bonus question: What property of the calling thread's cspace must hold for this to be ok?)
*/
/* initialise the new TCB */
error = seL4_TCB_Configure(tcb_cap, seL4_CapNull, seL4_MaxPrio,
cspace_cap, seL4_NilData, pd_cap, seL4_NilData, 0, 0);
assert(error == 0);
/* give the new thread a name */
name_thread(tcb_cap, "hello-2: thread_2");
uintptr_t thread_2_stack_top = (uintptr_t)thread_2_stack + sizeof(thread_2_stack);
assert(thread_2_stack_top % (sizeof(seL4_Word) * 2) == 0);
seL4_UserContext regs;
/* TODO 4: Set up regs to contain the desired stack pointer and instruction pointer
* hint 1: libsel4/arch_include/x86/sel4/arch/types.h:
* ...
typedef struct seL4_UserContext_ {
seL4_Word eip, esp, eflags, eax, ebx, ecx, edx, esi, edi, ebp;
seL4_Word tls_base, fs, gs;
} seL4_UserContext;
*/
/* TODO 5: Write the registers in regs to the new thread
*
* hint 1: int seL4_TCB_WriteRegisters(seL4_TCB service, seL4_Bool resume_target, seL4_Uint8 arch_flags, seL4_Word count, seL4_UserContext *regs);
* hint 2: the value of arch_flags is ignored on x86 and arm
*/
/* start the new thread running */
error = seL4_TCB_Resume(tcb_cap);
assert(error == 0);
/* we are done, say hello */
printf("main: hello world\n");
return 0;
}
int main(void)
{
int error;
/* give us a name: useful for debugging if the thread faults */
name_thread(seL4_CapInitThreadTCB, "hello-3");
/* get boot info */
info = seL4_GetBootInfo();
/* print out bootinfo */
print_bootinfo(info);
/* get our cspace root cnode */
seL4_CPtr cspace_cap;
cspace_cap = seL4_CapInitThreadCNode;
/* get our vspace root page directory */
seL4_CPtr pd_cap;
pd_cap = seL4_CapInitThreadPD;
/* TODO 1: Find free cap slots for the caps to the:
* - tcb
* - ipc frame
* - endpoint
* - badged endpoint
* - page table
* hint: The bootinfo struct contains a range of free cap slot indices.
*/
/* decide on slots to use based on what is free */
seL4_CPtr tcb_cap = ???;
seL4_CPtr ipc_frame_cap = ???;
ep_cap = ???;
badged_ep_cap = ???;
seL4_CPtr page_table_cap = ???;
/* get an untyped to retype into all the objects we will need */
seL4_CPtr untyped;
/* TODO 2: Obtain a cap to an untyped which is large enough to contain:
* - tcb
* - ipc frame
* - endpoint
* - badged endpoint
* - page table
*
* hint 1: determine the size of each object
* (look in libs/libsel4/arch_include/x86/sel4/arch/types.h)
* hint 2: an array of untyped caps, and a corresponding array of untyped sizes
* can be found in the bootinfo struct
* hint 3: a single untyped cap can be retyped multiple times. Each time, an appropriately sized chunk
* of the object is "chipped off". For simplicity, find a cap to an untyped which is large enough
* to contain all required objects.
*/
/* TODO 3: Using the untyped, create the required objects, storing their caps in the roottask's root cnode.
*
* hint 1: int seL4_Untyped_Retype(seL4_Untyped service, int type, int size_bits, seL4_CNode root, int node_index, int node_depth, int node_offset, int num_objects)
* hint 2: use a depth of 32
* hint 3: use cspace_cap for the root cnode AND the cnode_index
*/
/*
* map the frame into the vspace at ipc_buffer_vaddr.
* To do this we first try to map it in to the root page directory.
* If there is already a page table mapped in the appropriate slot in the
* page diretory where we can insert this frame, then this will succeed.
* Otherwise we first need to create a page table, and map it in to
* the page`directory, before we can map the frame in.
*/
seL4_Word ipc_buffer_vaddr;
ipc_buffer_vaddr = IPCBUF_VADDR;
error = seL4_IA32_Page_Map(ipc_frame_cap, pd_cap, ipc_buffer_vaddr,
seL4_AllRights, seL4_IA32_Default_VMAttributes);
if (error != 0) {
/* TODO 4: Retype the untyped into page table (if this was done in TODO 3, ignore this). */
error = seL4_IA32_PageTable_Map(page_table_cap, pd_cap,
ipc_buffer_vaddr, seL4_IA32_Default_VMAttributes);
assert(error == 0);
/* then map the frame in */
error = seL4_IA32_Page_Map(ipc_frame_cap, pd_cap,
ipc_buffer_vaddr, seL4_AllRights, seL4_IA32_Default_VMAttributes);
assert(error == 0);
}
/* set the IPC buffer's virtual address in a field of the IPC buffer */
seL4_IPCBuffer *ipcbuf = (seL4_IPCBuffer*)ipc_buffer_vaddr;
ipcbuf->userData = ipc_buffer_vaddr;
/* TODO 5: Mint a copy of the endpoint cap into our cspace, using the badge EP_BADGE
* hint: int seL4_CNode_Mint(seL4_CNode service, seL4_Word dest_index, seL4_Uint8 dest_depth, seL4_CNode src_root, seL4_Word src_index, seL4_Uint8 src_depth, seL4_CapRights rights, seL4_CapData_t badge);
*/
/* initialise the new TCB */
error = seL4_TCB_Configure(tcb_cap, seL4_CapNull, seL4_MaxPrio,
cspace_cap, seL4_NilData, pd_cap, seL4_NilData,
ipc_buffer_vaddr, ipc_frame_cap);
assert(error == 0);
/* give the new thread a name */
name_thread(tcb_cap, "hello-3: thread_2");
/* set start up registers for the new thread */
size_t regs_size = sizeof(seL4_UserContext) / sizeof(seL4_Word);
/* check that stack is aligned correctly */
uintptr_t thread_2_stack_top = (uintptr_t)thread_2_stack + sizeof(thread_2_stack);
assert(thread_2_stack_top % (sizeof(seL4_Word) * 2) == 0);
/* set instruction pointer, stack pointer and gs register (used for thread local storage) */
seL4_UserContext regs = {
.eip = (seL4_Word)thread_2,
.esp = (seL4_Word)thread_2_stack_top,
.gs = IPCBUF_GDT_SELECTOR
};
/* actually write the TCB registers. */
error = seL4_TCB_WriteRegisters(tcb_cap, 0, 0, regs_size, ®s);
assert(error == 0);
/* start the new thread running */
error = seL4_TCB_Resume(tcb_cap);
assert(error == 0);
/* we are done, say hello */
printf("main: hello world\n");
/*
* now send a message to the new thread, and wait for a reply
*/
seL4_Word msg;
seL4_MessageInfo_t tag;
/* set the data to send. We send it in the first message register */
tag = seL4_MessageInfo_new(0, 0, 0, 1);
seL4_SetMR(0, MSG_DATA);
/* send and wait for a reply */
tag = seL4_Call(badged_ep_cap, tag);
/* check that we got the expected repy */
assert(seL4_MessageInfo_get_length(tag) == 1);
msg = seL4_GetMR(0);
assert(msg == ~MSG_DATA);
printf("main: got a reply: %#x\n", msg);
return 0;
}
