On 05/29/2013 01:27 AM, Chris Johns wrote:
Sebastian Huber wrote:
The _Per_CPU_Information is part of the BSS segment and must be zero
initialized. Some processors may already poll some per-CPU fields and
wait for a state change at this point.
Please add comment to indicate this is the expected state.
There is a comment (patch 09/11):
typedef enum {
/**
* @brief The per CPU controls are initialized to zero.
*
* In this state the only valid field of the per CPU controls for secondary
* processors is the per CPU state. The secondary CPUs should perform their
* basic initialization now and change into the
* PER_CPU_STATE_READY_TO_BEGIN_MULTITASKING state once this is complete.
*/
PER_CPU_STATE_BEFORE_INITIALIZATION,
/**
* @brief Secondary CPU is ready to begin multitasking.
*
* The secondary CPU performed its basic initialization and is ready to
* receive inter-processor interrupts. Interrupt delivery must be disabled
* in this state, but requested inter-processor interrupts must be recorded
* and must be delivered once the secondary CPU enables interrupts for the
* first time. The main CPU will wait for all secondary CPUs to change into
* this state. In case a secondary CPU does not reach this state the system
* will not start. The secondary CPUs wait now for a change into the
* PER_CPU_STATE_BEGIN_MULTITASKING state set by the main CPU once all
* secondary CPUs reached the PER_CPU_STATE_READY_TO_BEGIN_MULTITASKING
* state.
*/
PER_CPU_STATE_READY_TO_BEGIN_MULTITASKING,
/**
* @brief Multitasking begin of secondary CPU is requested.
*
* The main CPU completed system initialization and performed a context
* switch to the initialization thread. Secondary CPUs should now issue a
* context switch to the heir thread. This normally enables interrupts on
* the secondary CPU for the first time.
*/
PER_CPU_STATE_BEGIN_MULTITASKING,
/**
* @brief Normal multitasking state.
*/
PER_CPU_STATE_UP,
/**
* @brief This is a terminal state.
*/
PER_CPU_STATE_SHUTDOWN
} Per_CPU_State;
--
Sebastian Huber, embedded brains GmbH
Address : Dornierstr. 4, D-82178 Puchheim, Germany
Phone : +49 89 189 47 41-16
Fax : +49 89 189 47 41-09
E-Mail : [email protected]
PGP : Public key available on request.
Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
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